As someone who generally likes the Pixel line of phones (not a fanboy; I just enjoy the stock+ android experience), I'm sceptical of the support on this tablet. My old Nexus tablet (I think it's the Nexus 7) is generally useless beyond basic offline usage because it doesn't get OS updates any more. Given the price, it's going to be a hard thing to justify at AUD$899 if it's going to be a security liability after 2028…
As a sibling noted, LineageOS would be the answer to 'what to do when Google EOL's this', in no small part because this is going to be a popular device.
My old top-of-the-line Samsung 12" lost support within a few minutes of it being released, but LineageOS support there is also good, and predictably it was faster without all the Samsung cruft.
Right now to replace that Samsung device it'd be a toss-up between this tablet, and the Lenovo P11 (at half the price). I'd prefer a slightly larger screen (1:1 ratio to physical text ebooks) but I expect both would have similar after-market life (via lineage).