Is this more "deGoogled" than something like GrapheneOS? GrapheneOS gives the option install a sandboxed Google Play (and the associated services), but it's completely deGoogled by default AFAIK.
I think the core difference here is that with graphene you use (if you want to) the google play services from google, but with very different security (iirc it runs like a regular app, without special access to the system).
But /e/ (horrible name btw) uses microG, which aims to replace parts of the google play infrastructure (but still relies on google servers afaik)