It only makes sense if Chelsea can win - otherwise Osimhen will only ruin his career, especially if he stays there for long. If he needs to win, it's a mistake to move to Chelsea. He needs to choose another club that can most likely at least win their league and who are decent in the Champions League. It's hard to say exactly which club would suit him and even more so which club would be able to accommodate him, but definitely not Chelsea
If you said Osimhen shouldn't join Chelsea because of their less chances of lifting the league title, this means you have automatic disregarded Chelsea, whereas with a player Victor Osimhen and few they will be adding up into the team , it can help fix up Chelsea and we see among the major contending this season.
PSG isn't the best option considering they can't win the Champions League, but it's still not bad. PSG are stable within their league, moreover if they manage to build a team this season, they might even do well in the Champions League. So choosing between Chelsea and PSG I think it's better to choose PSG. And besides, if it's not possible at the moment, then so be it
You guys are only looking at the short term stay of Osimhen without remembering that he will be spending at not less than two years if the deal got pend down, forgetting that this season has Chelsea has capacity yo lifting the FA cup, Carabou cup.