I don’t remember it from at the time because as I recall I decided that it was going to be a tory brexit which was going to be shit so I didn’t really care.
I did check
FactCheck: Corbyn’s changing Brexit stance which is from 2019. It accuses Corbyn of “changing his stance many times” but does seem to speculate and make stuff up a lot.
The only things the piece seems to actually confirm were that Corbyn consistently and over many years made a lot of (very reasonable) criticisms of the EU, and after the Referendum said that the Labour party would abide by it. He was always strongly opposed to a no-deal Brexit, and after a 2019 Conference vote passed a resolution for a second Referendum on the final bill he backed that. Was that equivocatory? It sounds fair enough given the Brexit we eventually got but as I say I wasn't paying a huge amount of attention.