I don't get either of their arguments. Yes, 180mbps is pretty fast for residential internet, but it's certainly not hard to get nor is there any reason to believe he was using residential broadband. The MS Word thing I didn't follow at all.
The data was likely initially copied to a computer running Linux, because the file last modified times all reflect the apparent time of the copy and this is a characteristic of the the Linux ‘cp’ command (using default options).
Don't get me wrong, I wouldn't put it past either political party to do something like this, but the evidence seems somewhat weak if I'm understanding it correctly.
I mean, file timestamps have been used by some really smart people to make intersting assumptions about what's going secretly on in very interesting ways, such as Tsutomu Shimomura reportedly looking at library access times while covertly on the same remote system as Kevin Mitnick to make assumptions about what he was compiling (I don't recall the source, it may even be made up), but this isn't one of them.
For more about the MS Word stuff, here's the page on that: http://g-2.space/intent/
I'll grant that it could also be related to some way the files were prepared in the interim, but it is at least worthy of considering where that metadata might have come from or been replaced through normal activity or intentional operations.