I'm a fan of Liam but also of Sam Smith, so I have always looked at all the updates etc and I can confirm Liam has NEVER misgendered Sam because they came out and started using they/them as pronouns only recently. When Liam said/wrote those things it was years and years ago.
The article about their pronouns came out in September while Liam referred to them as he/him in August. Stop making drama for everything just because you hate Liam.
Since my tweets are getting likes I leave this link here. It's about non-binary people and their pronouns, educate yourself
https://greatist.com/health/nonbinary#nonbinary-celebrities

Another thing :) https://twitter.com/PERFECTKMM/status/1312038860667465729?s=19