ISTR answering this question last week. I disagree that it's been retconned.
I agree. There's been some modest tidying up from the early, multiple-writer, throw-everything-at-the-walls-to-see-what-sticks, period, but the narrative of Dredd is more or less a straight line from Prog 2 to today, with the odd thing swept under the carpet, and the occasional gap filled in (like Origins).
(Nobody has ever said that the more outlandish humour stories never happened
, for instance… they're just not directly referred to these days.)