That's inaccurate. Some use little to any ester content, instead opting for Group I or II for solvency. AN's are a very recent addition to engine oils (outside Mobil), replacing esters in some recent Mobil products, but we've also seen examples of neither being used (current M1 FS 0W-40 for example).
Here's a PAO + Group II+ Mobil blending guide example:
View attachment 284258
No, most synthetics have no PAO in them at this point in the game, using Group III instead, due to cost.
Not all esters are cleaners, so just because an oil has some ester content does not mean it's a good cleaner.