However this article is from 2019, and I know they have some pretty snazzy gaming monitors today that might well be better than old top-end CRTs.
Most modern systems (and computers) are sending digital signals where entire frames need to be constructed and reconstructed in a buffer before they can be displayed. Many HD CRT televisions have terrible latency because they’ll take the analog scan line signal, buffer it into a frame, scale it to the native CRT resolution, then scan it back out to the screen. A high end PVM might allow a straight path, but there is maybe one Toshiba HD CRT that doesn’t introduce several frames of latency (iirc).
That said, from 1999 to 2008 I ran 1600x1200 on 19in CRTs and except for professional LCDs, nothing had resolution, pitch, and color that came close. For 2008 was the inflection point where cost and quality of LCDs exceeded CRTs.
HDMI and DVI-D are a digital representation of a tv signal --- there's all the blanking and porches and stuff (audio data is often interleaved into the blanking periods). You could process that in realtime, even though most displays don't (including CRT HDTVs; I trust your maybe one doesn't).
I've done it in Verilog on FPGA, for example.
But we do so on our machines because that's how the GPU/display controller pipeline works easiest from a software POV. That latency would be present on a CRT as well. What would be missing is the internal latency present in some monitors.
still, it's usually only 2 or 3 frames in game mode on a good display
This is a thing in the last 5-10 years, but was absolutely not a concern to the majority of display manufacturers before gamers complained. 100ms is significant in twitch games where network latencies are 20ms or lower.
The latency incurred for upscaling depends on number of the vertical filter taps and the horizontal scan time. We’re talking order of 10 microseconds.
The only exception is if you’re using a super fancy machine learning whole-frame upscaling algorithm, but that’s not something you’ll find in an old CRT.
The article is outdated (like you said) because LCD/OLED displays have long since surpassed CRTs in latency and refresh rate.
A modern gaming LCD can refresh the entire screen multiple times over before an old CRT scans the entire frame and returns to the top to redraw the next one.
There are Samsung TVs that have around ~6ms input delay, and many, many gaming monitors have 1-2ms input delay.
If you spend $400 you can get a 1440p monitor with 1ms input delay, 2-3ms grey-to-grey timing, that will do 240hz.
All with more contrast, color gamut, and resolution.
I'll take a wild guess though that my group (crt media watchers) is slightly less easy to take advantage of with actual hardware than video gamers which I'd guess to be the reason why there are few articles or HOLY GRAIL crt's like this fw900 widescreen in the media watching community. Not that we aren't often suckers for things like ORIGINAL VINTAGE POSTERS and SEALED MEDIA lol.