I've published hundreds of apps over the past 6 years and Google's review times had a similar spike during covid. It took a very long time to recover but now it's back to being bad, I can confirm that.
Indeed their product is an app that is little more than a webview that only shows one website, with optional value-add features. They handle publishing for the client, hence the hundreds.
I wrote about it a while ago, might be time to upsate that post. https://webtoapp.design/blog/time-to-publish-apps