Yes, it does sometimes seem like we are being propangandised here with these barrage of Mahayana quotes by this individual. Fortunately it’s pretty obvious that these later teachings are quite a different kettle of fish from the EBTs, and trying to map them to them can be like fitting a square peg etc.
The ancient Mahayana Buddhists were obviously aware of this too, they weren’t naive enough to not understand the disconnect doctrinally and historically. This is why they had to create myths like the nagas hiding the mahayana sutras, the myth of the three turnings and revelatory stories like the Maitreya Asanga myth. East Asian Buddhists also created the panchiao systems as a way to resolve the contradictions introduced by all these new texts , hierarchically placing sutras they liked at the top while placing the EBT material at the bottom as “hinayana”, thereby obscuring the earliest textual material. In the Indo Tibetan material, the situation is even more dire, EBTs are simply not studied at all, and whatever is left is a few texts which somehow survived the ravages of time.
Ultimately the kind of attitude that priviliges the novel, the more exciting and the flashier doctrines over the more subdued and subtle teachings of the Buddha is something we have to deal with. But thankfully suttacentral is an oasis from this.