Very interesting.
My sense is that the consensus historical view today among traditional Catholics of every variety is something like: the 1950s changes were not given second thought as they occurred - neither was the 1962 missal - then the Novus Ordo came along and suddenly there was an awakening and those 1950s and 1962 changes were scrutinized as well by traditional Catholics, which scrutiny continues today with differences of opinion.
This seems to me the prevalent historical view - I may be wrong, maybe this isn’t how most traditional Catholics believe things happened? - and perhaps it’s a view so entrenched as to be nigh uncorrectable at this point.
I say uncorrectable, implying that it is wrong, because the existence of these old tradition-minded priests exposes the falsity of this view of historical events, which view I think is often used to dismiss concerns about the 1950s changes and the 1962 missal as a bit of an afterthought - eg “sure the 1962 missal was a pretty big change - but no one was cautious or skeptical about it or outright ignored it at the time, so the Novus Ordo is what the focus should be” seems to go the line of thinking. It seems there were, in fact, priests who were skeptical of the 1950s changes and 1962 missal, even as they occurred, and these priests of old, informed by their Catholic formation impossible (sadly) to fully replicate today, did not need the manifest problem that is the Novus Ordo to “jolt them awake” as it were; the changes that began in the 1950s, at least to some priests, were viewed as seriously problematic enough to warrant ignoring them.
The question becomes how many were there of these priests - a few? A dozen? Dozens? Hundreds? Insofar as numbers mean anything, perhaps their existence militates in favor of the idea that the pre-50s/pre-55/pre-62 differences are, in actuality, essential components to the crisis that are hidden in plain sight - perhaps much more crucial than even people staunchly in one camp or the other (eg I’ve seen old posts strongly advocating for the pre 1955 Holy Week, I’ve seen posts staunchly citing Archbishop Lefebvre in insisting the 1962 is fine) realize.
Further muddying the waters is the matter that it seems most who favor pre 1955 today are sede, yet the priests of old who rejected these changes in real time were (probably?) not sede.
In other words, the line that these priests of old - that is, the very first forerunners of traditional Catholicism - walked is not really walked or advocated by any trad group today - these priests were neither sede, and neither did they follow the 1955 changes or any thereafter. And, to repeat myself, because of their thoroughly Catholic formation in an era now lost, this would warrant considerable weight given to their conclusions if these priests were great in number, notwithstanding, say, Archbishop Lefebvre’s adopted positions.
Just some jumbled thoughts going through my mind