Source please? It seems to be two episodes.

While I understand Cartoon Network should be the definitive source for this show, I've never found their episode listings to be satisfactory or complete (they don't even list the entirety of Season 2 per the link you provided).

Other sites tend to put the two episodes together and mark it with the extended runtime and I believe it was TMDB's policy to clump these part1/part2 episodes together as well?

Some sites that show the episodes as 1: https://www.hbomax.com/series/urn:hbo:series:GXkNWSAAXLo-njwEAABYM

https://www.amazon.com/gp/video/detail/B0877X4BHX/ref=atv_dp_season_select_s3

https://play.google.com/store/tv/show?id=X07ESXAGRgJFXjSxqUtL5Q&cdid=tvseason-CKCfm7vJYW3Gt4v0vstg2Q&hl=en_US&gl=US

The unofficial wiki for the show and TV Tango indicates the episodes were played on the same day back to back.

https://victorvalentino.fandom.com/wiki/Journey_to_Maize_Mountain

http://www.tvtango.com/listings/2020/05/23

However I defer to your judgement whether to make this 2 episodes or not.

TMDb's policy is to follow the original Cartoon Network release. While the seasons can sometimes be incomplete and/or inconsistant, the format of the episode at the time of release can still be used.