This author is taking the analogy to silos too literally, and constructs a weird argument around it that makes absolutely no sense.
The silo analogy is not about protecting academic integrity (in the way grain silos are meant to protect grain), it's about isolating teams from each other. If the physics department never spoke to the math department, that would be an example of what people mean by "silo" and a bad thing. It weakens both departments to be so severely isolated.
I have seen this in real academic disciplines, not just hypotheticals. CS academics have done a lot around modeling formal systems. Then you go over to systems engineers and they have done the same thing (especially around critical systems and safety properties of systems). Both have good ideas, but both domains operate largely in isolation from each other. This impedes their work, it's a pair of bad (though naturally occurring, rather than forced) silos.
If the author actually understood what people meant when they said silos need to be torn down, they wouldn't have written this bizarre blog post.
Another example of silos is that Doctor who tried to claim the trapezoid rule and name it after herself.
I agree, she is conflating things.