Quran 12:100 – Prostration Of Respect (Sajda-e-Tazeemi)
Situation (context) determines the meaning of a word. The former is against a human, in a court, in a manner the bowing is made before a king. and the latter is before God, so it can be the actual Sajda, the way it is done on such occasions by God-fearing people. The latter has been appointed as a sign of worship and gratitude to God only. This is the gesture of the lowest humility, which is not supposed to be done to anyone else other than God.
Yes but the words itself are falling down in prostration. If it was simply سجدوا له maybe I could sympathise. But it’s just an assumption that sajda is haraam to humans in our shariah which leads to the assumption that the sajda that yusuf’s صلى الله عليه وسلم parents and brothers did to him was not falling onto the ground even though those are the exact words of the verse. In Japanese culture, this sajda is done to humans to this day so it is possible it was the same in Egypt at the time. But these are all tangents- there is no clear reason given in your reply as to why the exact same phrase should be taken differently. Nothing in the context necessitates the conclusion you have come to.