Yeah interesting - I don't know how many say flatpaks will work on arm. I guess you're basically able to run most of what a raspberry pi can or whatever is in debian's arm repos though.
On lineage you can use auroura store too for a less googley halfway house.
The article mentions waydroid - but it doesnt go into that much detail on it. I find waydroid to be very good on a decent linux pc - but does it work well enough on ubuntu touch. I'd not do anything heavy though like mobile games on waydroid - that'd seem wierd.
Is there any benefit/cost though to effectively running your apps via a lineage v.m?
I'd think if there is it might come down to some wierd security thing but probably at cost of startup time or performance, or maybe even power consumption.
Have you looked at ubuntu touch supported devices?
That might do some tablets - although i guess they're focussed on phones - and I think have very little resources.