Arh yes, the good old "everything means nothing" argument. I'm sorry to say, but words have meaning [1][2], and most of them are formally defined.
And yes, I think that an HTTP POST to Microsoft's Windows Terminal team saying "UserUsedTerminalInInterative = true" is not a privacy issue, nor is it spying.
Can you explain to me how this information hurt users of Windows Terminal? If it indeed is spying, it should be possible to demonstrate how it is used for hostile purposes or why such an innocuous piece of information must be kept a secret.
Until then, I think it is fair for the Windows Terminal team to collect such basic telemetry for their software