The phrase I read was not "encryption certificate" but "technology certificate" which sounded more like something along the lines of a license for some third party IP, or an API key for a subscription service that Logitech had been paying for. But I agree it's a vague simplification and more details would be interesting.
It could be similar to when YouTube stopped supporting shorter encryption keys, and a lot of streaming hardware suddenly became useless because they couldn't support longer keys.
