The idea of Mr. Goenka being a bodhisatta is ludicrous.
He is teaching the Buddha-dhamma - he is not "turning the wheel of the Dhamma" for the first time in a world system. In other words, the current Buddhasasana still lives on. Yet, Mr. Goenka is a well-regarded teacher, here and now.
The implication of him being a bodhisatta, yet still living in the time of the Buddha's dispensation, is that he would deliberately refrain from attaining stream-entry in order to not attain nibbana until after the current sasana is lost. That's hardly a desirable attribute for a vipassana teacher, attempting to guide others in the way of insight meditation.
Whilst suggesting he is a bodhisatta was probably intended as praise by these students, if you look into the nuts and bolts of it, it's inadvertently insulting to Mr. Goenka and his life's work to realise and spread the supra-mundane path.