In general, the situation is the exact opposite: companies want to claim authority, but when an employee makes a statement they don’t like they want to have the deniability of “oh they weren’t representing us, if you want our real opinion please talk to our spokesperson”. Corporate PR is a strange mix of wanting engagement but also being incredibly risk-averse, and it’s very different from how people typically communicate.
I’m not sure how much authority being tech lead confers? It’s the lowest possible line management position. I wouldn’t expect a tech lead to have any influence whatsoever on legal, contractual or communication issues