The pace of progress is precisely why many people qualitatively assume the curve will flatten soon: J curves are generally (obviously not always) unsustainable.
You're arguing that the limits will appear because they usually do. (Correct my paraphrase if this is unfair.) Apart from being blind faith, this argument is oblivious to the fact that capability so far has scaled directly with compute and that the experts developing the models expect that to continue.
That is the lowest effort of lame responses. Look at the actual authors on the paper then. Or, I don't know, actually make a substantive comment about the research in the paper beyond your 8th grade redditor "Ha ha Siri sucks" response.