I know. But if people (including me) pointed at this specific example you are now giving as an example of continuity others said it wasn't explicit enough. Just a quick scene where we saw Ash's old badges, trophies, battle frontier symbols wasn't enough for them. Now, those days are definitely over. No one can still make those claims.
I would even say Journeys had explicit continuity as early as episode 1. We did see the scene again when Ash obtained Pikachu, this time mostly from Pikachu's point of view.
I think some people made their own headcanon already with the 'world journeys' concept and they hoped we would have big pieces of continuity every couple of episodes. Others were set on the soft reboot theory because this was a popular rumor before the start of Journeys. And I'm sure others were just trolling.