Resuming the options:
1. do the Tour for GC.
pro: he should be able to compete, disregarding any potential long-term covid effects.
con: he has a very short time, hasn't prepared any stages, and is thrown in the lion's cage. Patlev promised his parents he would be careful with Remco's trajectory when he signed him, and he wouldn't skip steps. Doing the Tour for GC is maybe skipping a step. Other con: he won't be ready / good for the World's.
2. do the Tour but not for GC (stage wins, helping,...)
pro: riding a Tour is always good for any rider, he can only come out better and stronger. Other pro: he has sacrificed much / trained hard for the Giro. Now that's gone, he needs another big goal. Other pro: he can ride himself into shape for the World's.
con: if he doesn't win a stage, it's a kind of 'lost' GT. Remco isn't made for filling the pack. Other con: no Vuelta. Other con: what about the rest of the season? It will be end of July and after the World's, there aren't many big goals maybe, or too far away for a 3rd peak (like Lombardia)?
3. don't do the Tour. Stick to the plan.
pro: not too much stress and the comfortable thought that he can take all the time to recover, but the pitfall is that no big goals usually don't lead to a lot of motivation / big performances.
con: small races / not as many race days / no real alternative (if no Vuelta) = filling up the calendar but for what exactly? Without another GT, this year will, in the end, look a lot like e.g. 2019 with only small stage races etc.
Just thinking about it, I still like 1 and 2 much better than 3., even if that would include doing the vuelta…life is too short to skip the Tour before you’re 30, Remco! He only had like 5-6 chances in his prime, so he should just do it, even preferably for gc, and see where he ends up.