They are freezing the asset, not appropriating it.
So Chelsea will remain Chelski. Tuchel, Lukaku etc will continue to be paid. They will still play Lille and Norwich and qualify for the CL semi finals.
They're not fucked in the least bit. The only difference is that Roman may no longer feel incentivized to rig the CL draw.
In the short term, and in footballing terms, not a lot changes, but the longer it goes on the more trouble they are in.
They can still play matches and pay costs associated with matches, and they can still pay players and staff, but they wouldn't be able to do anything else, which includes buying players, signing new contracts or anything that generates income. Presumably if it drags on under these conditions the business would not be sustainable.