Yeah.... his admission of having never worked on an Xbox X/s Devkit makes me leery. I trust that he knows his way around programming but, l he should get his hands on SKU before speaking in absolutes
Here's a controversial take:
1440p120 is a just a marketing purpose, it will run on indie games and non demanding foward ports of games like R6 Siege which also has the option to turn off vsync in consoles and get like 90-100FPS in that outbreak event mode.
1080p30-60fps is going to be the standard for it, the impact of going from 1080p to 2160p is huge on PC, couple that with lower res textures and technically, it's possible, heck, I could even go lower to 720-900p and put a upscaler, that dude is not wrong on that. And even cap the FPS to 30, since 60 FPS is going to be likely the median, if not, majority standard.
In other words, imagine that the PS4Pro and Xbox One X had games designed for them and it would require to use the standars of lower resolution and FPS to their base consoles conteupart to deliver a significant difference.