Strong disagree. Using 'they/them' when you're generally unsure about a person's gender isn't misgendering.
I'm a binary trans woman. If someone is generally unsure about my gender, because it can be ambiguous from time to time, they/them when referring to me is perfectly acceptable. I would suggest most other people are fine with they/them in this instance as well.
Pronouns can be quite a minefield to navigate, especially for those not used to using they/them when all they've ever known is binary terms growing up.
Speaking as an 'elder' trans person, some pronouns in use, which are just as valid as mine!, are genuinely difficult to remember because there are so many of them. I'm talking about the ones that aren't part of the English language in common use. I default to 'they/them' in those instances because using the person's assigned gender at birth would be genuinely hurtful; I don't want to hurt someone.
I feel very much that our own, gender diverse, community is driving those outside of it away by being so strict with/overt policing of pronouns, that those who aren't gender diverse find the whole 'pronoun' thing too complicated, then either refuse to engage with us or deliberately misgender because its easier. This is especially true for older conservative cis people.
https://revolt.chat/
It's open source too.