Have evidence for this? Because this was explicitly explained on several occasions in the anime prior to Journeys, which im pretty sure is a more credible takeaway on the matter of catching pokemon.
So unless you have something that says it was only "Advised" and not a requirement, it is a retcon.
"All the time" is a big understatement when Ash has, since by the time of XY and onward at least, never suffered from character inconsistency when it comes to Pokemon Trainer basics 101. Id say even DP Ash knew all of the basics from beginning to end and only suffered from "character inconsistency" around the time BW came in (since it rebooted his experience).
And even then, the point your missing here is that its not just Goh doing this. Everyone in Journeys catches Pokemon now like he and Pokemon GO players do, under this new format that never commonly existed in the anime before. Battling a pokemon in order to catch it has become an extreme rarity in Journeys to the point where it only happens once every blue moon, something that was far more prevalent and common in previous series. Even if not a retcon like you claim it isn't, it is far far more than simple character inconsistency. Its, at the bare minimum, blatant bad writing for throwing a common theme and rule the anime previously followed out the window (and thats saying something given the usual flaws the series writing has).
And thats the issue. It shouldnt be a second reaction to pokemon catching, it should always be the immediate reaction to catching them. As was commonly established in the anime prior.