From the title, my guess was this was going to be an interesting case of someone publicly admitting a mistake, in some lesson we could all learn from. Instead, the title functions as a clickbaity hook, to promote the fork that the author is ostensibly apologizing for making. (I don't know whether the fork is good, bad, or neither. Just, probably I should've guessed what the most likely meaning of the title would be.)
The title (which I indeed wanted to be a good catch phrase) was not meant to be an apology. English is not my mother tongue, so I may be misguided, but I meant "sorry" as "I am sorry about the state of affairs", not literally "I apologize to you, the sqlx library".