Yeah, I think this is a pretty big deal. I've never heard of any halfway decent prospect getting kicked out of INSEP. As far as character red flags go, that's up there.
And it's a shame too because INSEP has produced some players with genius level basketball IQ -- Parker and Diaw being two. (Those two and Horry might be have had the highest basketball IQs of any Spurs during the Pop era, tbh.)
Give Doumbouya even 20% of that basketball IQ and he's a top five pick. Instead he got kicked out.
Is that alone reason for the Spurs not to draft him? Maybe. Then again, they probably still have enough French connections to figure out exactly what happened . . .