> Blockstream employees have for years been extremely vocal opponents of increasing Bitcoin's block size
Yes, for many years, years before Blockstream even existed!
Edit: note that these very same developers are also pushing for segwit, which doubles the block size and the on-chain transaction capacity of the bitcoin network. It's quite odd to say they're "opponents of increasing Bitcoin's block size" given that they want to double it. What they're really against is specific proposals for increasing the blocksize, proposals which break compatibility and introduce a chain-split risk for no good reason.