The "O" argument

[judge]

Likewise, the unification of the Peshitta tradition can be explained. It was used by only two communities, essentially isolated from outside influence. Because old versions are regularly burned or buried, we would eventually expect to naturally find no more variants, even where there were variants originally.

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A problem I see with this is that we have no evidence or record of any such unification.
In modern times the idea of editing and unifying of texts seems to have started with criticism of the Hebrew bible or OT. But here the arguments were carefully put together on internal evidence within the books themselves.
No such parallel can be found in the peshitta (at least that I have seen put forward).

I just dont think this sort of argument from silence, without corroborating evidence, can have legs.

On the other hand the bifurcation of the peshitta into the peshitta and peshitto does have an explanation. That being that the westerners, under the influence of the Byzantines changed Acts 20:20 and Hebrew 2:9 for theological reasons and added the other five books as those in the west had done.