That's not what the Twitter reply said. They said valid interest to sponsor forms. You are inferring.
Do you work for IRCC? Why are you so adamant?
None of us really know what they will decide to do. Most of us who are applying are hopeful for everyone. There is still the benefit of doubt that they might just process all the valid applications they received this year.
Why spend all the money to process it all (as you said it is expensive) collect all the fees we paid. And then what.....return several thousand?
Those of us who are vested in the 2019 PGP are hopeful.
They promised the excess applications would have priority the next year so not wasted processing or fees. We have yet to see how many excess applications there will actually be. Could be quite minimal.