Thanks Brogan. I guess I expected the submit date to change more often (due to subsequent newer sitemaps being submitted). Maybe I don't understand how sitemaps work...but doesn't a sitemap for an internet forum take into account all threads & thread posts on the site as of the date the sitemap is generated & submitted?
If this is the case...wouldn't a sitemap submitted on July, 7th 2020 only contain forum threads & posts as of that date (July 7, 2020)...and nothing after this date? Wouldn't that mean that Google wouldn't be aware of any new forum threads/posts since July 7, 2020...almost 12 months ago?
Thanks