"there are no offical" records but many rumors and signs exist that prove ties are present.
One thing is to look at is Bitcoin dot com exchange. Along with the how Roger claims to invest in "every" buisness that used bitcoin in the early days....

Blockstream, manufactured the massive bitcoin v cash

not really true but not wrong forsay. Wouldn't deny the ties but there were more than just Blockstream present and reason for existing. No side wanted to back down leading to the bitter debate.
Segwit 3x seemed right but it would of lead to a whole cans of worms if it passed.
Extension block would of ironically been the best deal for both sides.
They don't own all the mods but many do support Blockstream.
Censorship is true and not r/btc does have some as well.
It just a messy drama that could of been handled better a bitter Divorce.
(Also you didn't comment undermind and would of missed this had i not seen an upvote)