How to understand when Zelensky is lying? Just see whether his mouth is open.
He cites numbers as low as 31,000 for Ukrainian KIA during two years of the conflict. Even a couple of hours in Telegram or TikTok, dedicated to survey of videos from Ukrainian cemeteries and churches where people constantly kneel before coffins of dead soldiers and citizens, should suffice to surmise that something close to decimal order of magnitude is omitted in his stats. And not only his.
For the same reasons of propaganda production and consumption, he (and Rammstein coalition) highly likely exaggerates losses of Russian combatants greatly.