Based on the way the quote rule has been enforced throughout my time here, at least, this was not a rule violation.
The text inside a formal, board-generated quote box, leading with “Originally posted by…” is considered sacrosanct. Any other use of quotation marks, italics, etc. to quote ( or misquote) a poster has never been considered to be the same thing. Here is just one exampleof dozens that I can find right away, where TPTB reinforced the idea that text outside of a formal quote box can be edited.
This came up recently in another thread, and despite a few mods indicating they thought “a quote is a quote” initially, the final decision as posted by Colibri was that it is only a rules violation if using the quote box with attribution.