Question: Is there a particular reason why games released past March 27th (03-27) wouldn't be appearing on the shop?
I had to manually update the HBG app to 8.1, downloaded from their website, on my brothers Switch (FW 9.1.0) and went ahead and installed Blawar's latest Neutos Atmosphere fork knowing that standard Atmosphere would eventually interfere with the HBG shop. The Switch works just fine, games load and play, Tinfoil installed without issue, but upon executing the app it didn't initially show games, updates, or DLC. Didn't indicate it needed to update or anything. For whatever reason the app installation didn't include the various HBG shop URLs so I put those in, as well as the recently resurrected "JITS" URL, and now the relevant download categories show but only display games released on or before March 27th.
The app version is 8.1.0, revision 40. I didn't copy over the exfs or kip patch folders as I presumed those would be unnecessary with Neutos. This Switch doesn't have an SX OS lisence.