>> AFAIK, at least Hermans and De Groote are co-owners/shareholders of
>> Hyperion Entertainment CVBA.

> That is a little unclear from previous statements made by HyperionMP.

If we are to believe Hyperionmp, "Ben Hermans & family" are the sole owners of Hyperion Entertainment CVBA (and thus De Groote and Mincea its 2 non-owning employees). Thing is, a CVBA needs at least 3 shareholders (btw. that's what defunct A-Eon Technology CVBA needed Anthony Moorley for):

https://www.awdc.be/en/types-companies-belgium

This means the 3 current, publicly known directors may all be shareholders. And as Mincea joined only recently, he may either have replaced a former, unknown shareholder or there may now be at least 4 of them.
...or, Hyperionmp tells the truth and Hyperion Entertainment CVBA is owned by Ben Hermans and 2 or more members of his family. I guess we won't know for sure until someone purchases these information from the Belgian company register :-)