Pretty laughable, considering Parag as CTO presided over the slowest product velocity at pretty much any major tech company. The product is almost unchanged, except additional censorship, since he started as CTO in October 2017.
With that track record, one must assume his head will be one of the first on the chopping block.
I don't see slow change as a net negative. It's not necessarily positive, either, but not trying to fix things that work perfectly well is a good mantra (looking at you, Google).
Also, he was recently promoted to CEO, which would be strange if the common opinion at Twitter was that he failed as a CTO.
With that track record, one must assume his head will be one of the first on the chopping block.