The dev is talking about ease of use, not power. Series X is still more powerful regardless of how anyone spins it. The devkits are easier to use for PS5 than Series X, hence why devs were complaining about getting dev kits late from MS, so likely Xbox is lagging behind in that sense. At the end of the day, the difference between both consoles were always going to be minimal and that is how it has turned out. Just like how everyone was saying ps5 SSD is 100% faster than Xbox and we would see loading times twice as fast on ps5, but looking at real world examples it ends up being 1-3 seconds difference or Series X loading faster in cases.