Jep, there are some shots in the dark but generally spoken with reference to ROF actual engine, he is mostly right.
Only thing to mark is the DCS thing. Noone ever requested into deep, how the flight modelling is done in the DCS series. My guesses to that: It has also no sufficient up to date flight models. I know of helicopter pilots saying something about incorrect FM at blackshark. But DCS is not having the priority on fm. It is all about learning and using the systems. So I really doubt, that the p51 is modelled right!!! U most also see, that a ww2 combat series within dcs is not really in discussion and would take about 20 years to deliver enough planes, not mention the VERY bad ground details and LODs. This will never happen and they will stick with modern fighters to combine more planes to what they began with a10 and blackshark.
But again: No discussion possible on graphics. Clod has better graphics and more powerful engine. There is nothing to discuss about it. Graphics are never subjective. You can measure it and you cannot mention the graphics together with performance issues, as this is another topic.