I think he suffers from being at a club that isnāt PSG. French football has a bad rep in England (especially among Big Six fans) because itās lower in quality other than PSG. What makes it worse is that Rennes finished sixth in Ligue 1, which is a good finish (they qualified for the Europa League), but realistically if they were in the Premier League they would be midtable, probably a āsleeper hitā if they qualified for Europe (think Sunderland but with less money spent and nicer weather).
Now, obviously not every EPL player or coach comes from top teams, in fact most donāt. However, fans of Big Six clubs prefer that the clubs focus on poaching players and teams from other top teams. Iāve said on here before for example that Spurs fans were suggesting we get Jürgen Klopp, Xabi Alonso, Xavi or Zinedine Zidane after Thomas Frank was sacked, even though we were battling relegation. To give a player example, Iāve heard some people suggesting that Spurs should ignore the Serie A barring the absolute superstars because the quality isnāt good enough, based on the failure of Radu DrÄguČin and being unimpressed that we were linked with Rafael LeĆ£o (and this was before he made that sexist-sounding Insta story, but after his temper tantrums against Lazio and Chile). On the other hand, fans of smaller clubs appreciate anyone they can get which is why they shop so much for French players that donāt always make the Bleus squad.
Personally though, I donāt mind where the player came from so long as theyāre good enough. And as you said, I would love to have a striker like him at Spurs, especially since heās scored multiple goals against PSG. Heās on Man Cityās raider but realistically he would be a backup there, so if he wants to make the Euros squad for France his best option is to play higher than Ligue 1 but where heād still start games. Heās better than Richarlison and Dom Solanke so Spurs is a great fit.