Seemingly many people put an equal sign between hiring and recruitment - while those are two fundamentally different things. The fact that someone gets hired (i.e. signs a labour contract or service agreement with a company and starts working for it) doesn't mean that there's any recruitment going on. Recruitment is about looking for external candidates for a vacancy which cannot be filled internally. And the internal candidate list is bloody long these days - people recruited pre-COVID who passed their training but were not immediately hired, people who have been laid off or sent on a long-term unpaid leave, people who are known to the employer and often have a previous working history with the company... Once all of those have been hired, we can speak of recruitment of external candidates. And, as it has been rightly mentioned in the advert, that's not happening this year.
What are the implications of this on the advertised scheme? That you'll probably have to pay for the course quite soon, but you'll only start earning and getting a return on your investment in Q1 or Q2 2022, if nothing goes badly wrong by then. As long as you're prepared for this and you have a realistic scenario for how to keep afloat for this year, then go for it. Also, if you need a loan for the type rating, you'd better be conservative about your earning potential when calculating how much you can afford to repay every month. The end figure is quite nice if you always do 80 hours per month, but what if you do half or quarter of that due to another round of travel restrictions? This needs to be taken into account as well and plans need to be made accordingly.
So, as long as you've considered the aforementioned - you're good to go. The only way to stay out of trouble is to consider any possible less-than-optimistic outcomes and be prepared for those.