Of course it is a EULA clause - it's very literally attempting to restrict what you can do.
And this kind of clause is simply void under German law, because if you buy something, it's a contract between you and the seller, and this kind of contract is not allowed to contain arbitrary limitations on how you can use the thing you have bought, nor can the seller impose an implicit additional contract between you and some third party on you.
The point of a EULA is that you, the end user, agree to the license, effectively signing away legal rights that you would otherwise have.
This is not asking for agreement, and the government of Germany has already imposed the implicit additional contract by granting a patent monopoly, the only purpose of which is to restrict the behaviour of others.
The text is only giving back what German law has already taken away, the ability to use these 900 odd bits of mathematics, but only for personal, non-commercial reasons. If you want to use it commercially you'll need to negotiate another licence.
And this kind of clause is simply void under German law, because if you buy something, it's a contract between you and the seller, and this kind of contract is not allowed to contain arbitrary limitations on how you can use the thing you have bought, nor can the seller impose an implicit additional contract between you and some third party on you.