I mean, it's wrong, but in the too-educated direction, not the not-educated-enough direction.
The fact that the c in tacit is usually pronounced softly is tacit knowledge
You misunderstand me - I am saying he pronounces the 't' in 'et' like a K.
Many classicists believe the Latin C sounded like our K. So you get words pronounced like Kaesar, ketera, kivis, etc.
Pretty sure the comment was about the video narrator pronouncing it "ek setera", not "et setera" or even "et ketera" (I counted 3 instances). And I agree, just like people who say "supposably[1]", it exposes somebody who isn't well read.