He is quite lucky compared to a lot of long haulers because he can continue to work. Quite a lot of them can't get out of bed or leave their homes and are in agonising pain all the time. There is no treatment, the vast majority are not recognised or accepted as ill by their doctors at all. So to an extent Lewis is super lucky, he has it extremely mildly to the point where he can not only work but do so at a high physical exertion level.
He hasn't said if he is suffering post exertional malaise from these big exertions but if he is suffering like that he needs to stop. There is one consistent thing about recovering from post viral conditions and ME/CFS that is consistent, those people rested and avoided PEM energy crashes. If he is suffering PEM he could be making himself worse and could end up severely disabled. I doubt any doctor will tell him this because its been denied for about 80 years now but many millions around the world suffer with these conditions of which long covid is just the most recent, some 8% of everyone who caught SARs still has ME/CFS to this day, they aren't going to get better.
Lewis may very well need to stop racing and training for the forseeable future to protect his life, post viral conditions can kill you if you push but in the short term there is a good chance if he suffers the days after race day he is in big trouble and likely needs to stop racing and training if he wants a decent chance of recovery.