I saw this string months ago and haven't commented prior to this post.
Disclaimer; RE: Disclaimer: My twitter account contains the very same one that is mentioned in the OP.
With that said, I don't use this disclaimer as some kind of shield from being fired by my employer for uttering potentially offensive things... instead, I use the small amount of common sense that I possess to not post offensive things that would lead someone above me in the corporate food chain to consider firing me - if only to protect the brand/company from potential damage which could ensue based on my public words.
The primary position driver here, imo, is whether or not you are a sole operator vs being part of a team. Sole operators can say whatever they want to say and the fallout falls entirely on them and theirs. When you are a part of a team, the dynamic is - and should be recognized as - different.
I am a US citizen protected by the Constitution. But I am also an employee of a company - and a part of a team. When I engage publicly - on any topic - I understand that even though I have a constitutional right to free speech, this right does not shield me from the responsibility I possess to protect my employer (team) from any fallout caused by the words I utter publicly.
Finally, I want to thank John (and his team) for allowing us all to utilize the Undisclosed posting function. As an IPVM OG who has an opinion on lots of things, I take liberal use of this feature that allows me to engage constructively without having to worry about the need to protect from the above-mentioned potential dangers to my team.