Qimir's trying to frame the Jedi in a bad light, but his lies are ones of omitting important facts, not of outright lying. Like, i don't think anything he's said so far has been false. It's just carefully said to avoid any information that'd make him look bad or make the jedi look good. "Freedom to use my powers the way i'd like, without having to answer to Jedi like you" for example. The line is the same as if he said "I want to be able to use my powers however i like without anyone being able to stop me", he just said it in a way that makes the jedi seem like the bad ones. He's a Sith. He's a villain, his "freedom" is one where he gains everything and others are hurt as a consequence of it, but the way he framed it makes it seem like he's a good guy opressed by the jedi. yeah.
Point is, he's really deceptive in the way he talks about things. If Vernestra was his master, he made it out as if she attacked him out of nowhere when most likely he's fully responsible for what happened.
" Beyond the surface of consciousness are powerful emotions. Anger, fear, loss, desire."
What's bad about those emotions is giving into them and letting them control you, which is what Qimir is teaching Osha.
He believes those emotions give you power, but that's the whole allure of the Dark Side. It teaches you to give into your negative emotions and selfishness in order to achieve power, but ultimately it only leads to you becoming a slave to those emotions.
My favorite NON-KYC crypto exchanges for trading cryptocurrencies.