Do you agree with the tweet?

No. I do not. There is no connection between his subject and his message. Very illogical at best.

At what minority size are consensus change requests dismissible? if not a known quantity, how about a relative one like "any size smaller then the privacy minority"

If we are talking about consensus, we cannot avoid what is agreed upon unanimously. Almost everything negligible will look dismissible. But then again look at DEI.

Can we deem something needless by the size the group that wants them in advance, before such wants are easy and forever possible to meet?

The spirit of time is in favor of the minority nowadays so labelling something as needless is just resorting to generalizations.