On top of that I'd imagine that during the 8 years or so, he probably took out at least 200k EUR in salary, if not more, per year. So a few millions of dollars probably went to the CEO.
Edit: example news from a few hours ago: https://www.svt.se/nyheter/lokalt/vasterbotten/northvoltarbe...
It's unclear if the employees receiving that are actually top management, but honestly, I would be surprised if they're not, as they are the ones who always get this sort of bonuses.
EDIT 2: you don't need to speak Swedish to understand what North Volt itself wrote is about a bonus program, so yes, it most definitely is a bonus: "bonusprogrammet är avgörande för att upprätthålla arbetsmoral, motivation och lojalitet"
Edit (following your edit): You wrote earlier: “including paying millions of dollars in bonus to their incompetent executives”. The link you shared directly contradicts this since it mentions the equivalent of 6M USD distributed to about 230 employees. Another article mentions very explicitly that top management is excluded. According to these articles, it is simply impossible to conclude that top executives will receive “millions of dollars”. You’re just contributing to rumors that are not based on facts.