Those are official stats from Ukrainian Armed Forces, and they are absolutely realistic, even if approximate. If you're in doubt, follow Bellingcat, OSINTtechnical and people like Christo Grozev who coordinate open source intelligence / confirmation based on available photos / videos. They mostly confirm those numbers.
How about the one off battle stats? There seem to keep being reports of hundreds of vehicles destroyed in singular events. These don't seem to be reflected in the totals even days later though. I'm not clear on whether its because they don't actually have the capacity to count this stuff or if its partially bluster.
Donate here https://www.comebackalive.in.ua/donate, stop supporting the Russian economy and reject their products, rally local leaders to strengthen economic sanctions and increase Ukrainian support.
I have the "living in peace-time democracy" luxury of taking "official" figures with a grain of salt - but I'm pretty sure your government is waaaaaay behind Moscow's one as far as propaganda is concerned.
