This is a very confusing view. If increasing block size were the sole goal, then the miners would switch to Bitcoin Cash and obviate the whole thing. Why the middle ground if they're looking to attack -- if 90% of the hash power switched to Bitcoin Cash then Bitcoin would be dead in the water.

The mining community seems split between strong segwit supporters and large block supporters. Segwit alone was not able to achieve consensus and would never have activated. Segwit2x was a compromise that conceded segwit in exchange for an increase in the block size.

If the goal of the miners is to increase centralization by increasing the block size, they had the opportunity to switch to Bitcoin Cash when it forked. Note that I don't completely buy the centralization argument, especially when we're talking about a 2MB -- it's not like 1MB is some magical number handed down by Ganesh. The main risk of the increase has always been the attendant dangers of a hard cork.

I'm a Bitcoin Cash supporter, but even I'll admit that Bitcoin Cash is a direct attack on Bitcoin (Core), that was not entirely successful, although more successful than opponents thought it could be.