Hmm, not so sure. Nepal, Thailand and Vietnam have been "confirmed" in press interviews since the shutdown one way or another. Piecing everything together, I think this only works if the route changed multiple times:
1. Original race course developed prior to Dec 2019 with Nepal, Thailand and Vietnam. Finalists are set by this point, contestants apply for visas.
2. Sometime in Jan/Early Feb 2020, production sees the outbreak of COVID and scraps Asia entirely from the route. Final cast is locked and skipping Asia is conveyed to contestants prior to departure.
3. After Feb 22 2020, production sees COVID outbreak worsening in Europe and beyond, looks at shifting the remainder of the race through South America.
4. Feb 28 2020, production shuts down with no viable options to complete filming and sends racers home from Scotland.
Add on the obvious rerouting after COVID hit for the September 2021 filming and we're potentially looking at a lot of shifting of legs from the original plan.