No, this modded apk doesn't support multi-player mode since the same exact file is being shared on my website. Except for some extra xml files embedded within it that will allow you to install and use our special one-click root tools, there isn't a single bit difference between the original apk and my modified apk that you'll download from our website.
Sharing a single file (apk) in multi-player mode is against the Google Play Developer Distribution Agreement, so even if I wanted to, I couldn't add this feature to my bike race modded apk.