Is there a reason this does not include buffer chests? Any reason for the warehouses from the warehouse mod not being included, since this already includes the trains from 5dim's mod?

It looks to me like the inventories for buffers and warehouses are there, but you can't see the different types unless you click on a specific item (i.e. they don't have separate filter columns on the main page).

I'm not using the warehouse mod, but it is working for K2 warehouses.

For the warehouse mod, last I checked (last week) it did not include them. The "totals" count would be significantly lower because I was buffering a lot for specific manufacturing lines.