I removed hundreds of pages that had absolutely no traffic from my site, without any form of redirect. Within 2 days total traffic halved and then stabilised. Now, a week later slowly picking up again.
You should remove all your <lastmod>, <changefreq>, and <priority> data from your sitemaps. Google says they don't use it. It is just extra bloat making your sitemap files larger with no benefit to you.
In fact, sitemaps have almost no SEO benefit. See The Sitemap Paradox. Google will crawl pages listed only in a sitemap, but it ...
The links you provide give both the same error
You don't have permission to access
"http://amd.cdn.example.com/adultswim/episodes/us_geo/" on this server.
Try to make your website public before using Sitemap Generators otherwise they are not able to crawl your website.
This is a bug on Google's side, not yours. We had the same issue with several clients' websites, Google keeps promising to solve it but no luck so far. Try submitting each page manually:
Go to URL INSPECTION
Type in the URL
Click REQUEST INDEXING
Extra manual work of course, but a temporary solution until Google sorts it out.
True, the limit to an XML sitemap is 50MB (uncompressed) and 50,000 URLs. This is also the limit for any type of sitemap file, including HTML; any more than that, and the engine will stop crawling any single file. Also, @Evgeniy is correct that HTML sitemaps are pointless; nowhere in SEO literature does it say that Google or any search engine likes these ...