The car in the article has the steering wheel on the left, which is the wrong side for vehicles driving on the left-hand side of the road. Domestically-produced cars in both the UK and Japan have the steering wheel on the right.
RISC OS has the concept of "OS units" which don't map directly onto pixels 1:1, and it was possible to fiddle with the ratio on the RiscPC from 1994 onwards, giving reasonably-scaled windows and icons in high-resolution modes such as 1080p.
That's only RISC OS 2 though. RISC OS 3 was 2MB, and even 3.7 didn't have everything in ROM as Acorn had introduced the !Boot directory for softloading a large amount of 'stuff' at boot time.
And the co-creator of ARM, Sophie Wilson, still works for Broadcom - the company which bought part of the remnants of Acorn (Element 14). This is where Eben Upton worked before going off to start the Raspberry Pi foundation.
Jack Lang was involved in the Pi, having also been involved in Netchannel, the STB company which used the Acorn technology and had funding from Hermann Hauser, co-founder of Acorn.
David Braben, co-author of Elite (and author of Zarch/Lander for the Acorn Archimedes) was an early Pi supporter.
The various Sun 'JavaStation' NC models retain the SPARC CPUs of their workstation line - they definitely do not use ARM.
JavaOS was in ROM, on a module that can be removed (SIMM-style form factor). At one point people started to use BOOTP to run Linux compiled for SPARC as a replacement, as JavaOS was unpleasantly slow on JavaStation hardware.