This is no less ideological than what you purport to oppose, which is the problem in a nutshell. In the absence of religion, most of us have become religious about little, largely inconsequential lifestyle choices, with food being the most common hill to die upon, and producing some of the most strident adherents. Beware anyone telling you what you should or should not eat, because they're invariably a charlatan pushing some agenda. Ideally, you'd make some experiments and see what your body tolerated the best, but it's far easier to just cargo cult onto the trendy or virtue-signalling diet trend.
As long as you're not trying to live on pixie sticks and cheetos, you're going to be okay.
Those stagements are pretty much consensus among educated (as opposed to self-propelled) nutrition experts. There is little controversy in saying such a thing.
Note however that the person said "centered around" not "should consist of". That allows for leeway in any direction.
Another discussion is that of dietary choices being "inconsequential":
Food production has large consequences, and small individual choices can on a population level be far from inconsequential.
There are a mountain of studies supporting this kind of diet. And it's the diet the healthiest populations in the world eat. The only diet religion is people trying to somehow claim that stuffing yourself with butter and bacon is healthy.
Oh, there are certainly a multitude of diet religions out there. Paleos, vegans, vegetarians, pescatarians, non-celiac glutenphobes, ketos, the list goes on and on. Recently my mother-in-law read a book blaming all of the ills of the world on lectins that she took to heart, and wouldn't eat beans or tomatoes or grains for months.
The most aggravating thing about the diet religions is that nobody seems to be able to keep to themselves and practice quietly, they are compelled to evangelize and convert the heathen to the True Way. It's very tiresome when you have more important things to be concerned about than what you are putting down your gullet.
As long as you're not trying to live on pixie sticks and cheetos, you're going to be okay.