[Samsung Galaxy S (4G Model)] FBis251:
I examined the zip file and the installer script has the following:

ui_print("Samsung Galaxy S 4G Debloater");
ui_print("");
ui_print("Brought to you by Team Acid");
ui_print("Created by Fernando Barillas (FBis251)");
ui_print("");
ui_print("Mounting mount points");
run_program("/sbin/mount", "/dev/block/stl9", "/system");
run_program("/sbin/mount", "/dev/block/stl10", "/data");
run_program("/sbin/mount", "/dev/block/stl11", "/cache");
ui_print("");
ui_print("Deleting Amazon Kindle");
delete("/system/app/Kindle-OEM-2.0.5.103970165-20110202.apk");
ui_print("Deleting Amazon MP3");
delete("/system/app/AmazonMp3.apk");
ui_print("Deleting Buddies Now");
delete("/system/app/BuddiesNow.apk");
ui_print("Deleting Car Home");
delete("/system/app/CarCradle.apk");
ui_print("Deleting Desk Home");
delete("/system/app/DeskCradle.apk");
ui_print("Deleting DriveSmart System");
delete("/system/app/DriveSmartHelper.apk");
ui_print("Deleting DriveSmart");
delete("/system/app/DriveSmart.apk");
ui_print("Deleting Home screen Tips");
delete("/system/app/Protips.apk");
ui_print("Deleting Inception");
delete("/system/app/MovieShortcut.apk");
ui_print("Deleting Layar");
delete("/system/app/Layar-samsung.apk");
ui_print("Deleting Media Hub");
delete("/system/app/MediaHub.apk");
ui_print("Deleting Mini Diary");
delete("/system/app/MiniDiary.apk");
ui_print("Deleting My Account(2)");
delete("/system/app/sihome-signed-aligned-tmo-android-8-prod-107357.apk");
ui_print("Deleting My Account");
delete("/system/app/MyAccount-5.0.3002.apk");
ui_print("Deleting Slacker Radio");
delete("/system/app/slackerradio.apk");
ui_print("Deleting Swype Tips");
delete("/system/app/SwypteTip-release.apk");
ui_print("Deleting T-Mobile Contacts Backup");
delete("/system/app/MobileBackup.apk");
ui_print("Deleting T-Mobile TV HD");
delete("/system/app/com.mobitv.client.tmobiletvhd.apk");
ui_print("Deleting Telenav GPS Navigator");
delete("/system/app/Telenav.apk");
ui_print("Deleting ThinkFree Office");
delete("/system/app/thinkdroid.apk");
ui_print("Deleting Video Chat (Qik)");
delete("/system/app/qik-11.52-release-tmo.apk");
ui_print("Deleting Wifi Calling");
delete("/system/app/WiFi-Calling.apk");
ui_print("Deleting Write and Go");
delete("/system/app/WriteandGo.apk");
ui_print("Deleting Yahoo Finance Clock");
delete("/system/app/SamsungWidget_StockClock.apk");
ui_print("");
ui_print("Unmounting mount points");
run_program("/sbin/umount", "/system");
run_program("/sbin/umount", "/data");
run_program("/sbin/umount", "/cache");
ui_print("");
ui_print("Bloatware deleted");

These are the apps you asked it to delete including the absolute path to the file:

delete("/system/app/Kindle-OEM-2.0.5.103970165-20110202.apk");
delete("/system/app/AmazonMp3.apk");
delete("/system/app/BuddiesNow.apk");
delete("/system/app/CarCradle.apk");
delete("/system/app/DeskCradle.apk");
delete("/system/app/DriveSmartHelper.apk");
delete("/system/app/DriveSmart.apk");
delete("/system/app/Protips.apk");
delete("/system/app/MovieShortcut.apk");
delete("/system/app/Layar-samsung.apk");
delete("/system/app/MediaHub.apk");
delete("/system/app/MiniDiary.apk");
delete("/system/app/sihome-signed-aligned-tmo-android-8-prod-107357.apk");
delete("/system/app/MyAccount-5.0.3002.apk");
delete("/system/app/slackerradio.apk");
delete("/system/app/SwypteTip-release.apk");
delete("/system/app/MobileBackup.apk");
delete("/system/app/com.mobitv.client.tmobiletvhd.apk");
delete("/system/app/Telenav.apk");
delete("/system/app/thinkdroid.apk");
delete("/system/app/qik-11.52-release-tmo.apk");
delete("/system/app/WiFi-Calling.apk");
delete("/system/app/WriteandGo.apk");
delete("/system/app/SamsungWidget_StockClock.apk");

Unless you pushed the go sms apk to /system/app and renamed it to one of those file paths, there's no way my script deleted your app.