The quotes from the article backup my conclusions atleast in my view.
"In terms of performance, the development, compared to 2020, is significant. I think we will be competitive again. We will no longer be the worst on the grid. But we cannot know where we are until we see how much the others have progressed. "
He says they won't be last and immediately qualifies it with it being dependent on others, this simply reinforces my view that he is saying it with respect to the engine power levels this year and not next year.
Of course they are going to make a big step, my point is they have no way of knowing whether they will be second best (highly unlikely given Mercedes and Honda will be making big steps) or last. In any case the engine spread next year should not be more than 20 HP maximum.
I am not saying Ferrari are bad engineers even once or that they lack competence. My only question is that if they bring 50 hp they will be almost at the levels of the 2019 engine peak power and much more than the 2018 engine, if they could develop such a powerful engine without resorting to grey areas in one year that too in the middle of a pandemic, why did they not do it since 2018?
I hope you recognise that my opinions or questions are not targeting Ferrari as incompetent, we definitely need a strong Ferrari. My only point is that it's very unlikely they won't be the weakest engine next year unless Renault bring no updates at all and by 2022 they probably should definitely be nipping at the heels of Mercedes or matching/exceeding them in a best case scenario. This is why they agreed to an engine freeze at the beginning of 2022 and not end of 2021.
“Hamilton’s talent is perhaps even more than that of Ayrton or Schumacher or Fernando." - Rubens Barrichello