Well, because it’s wrong. Graphene fanboys usually just repeat what the lead devs says. This user’s comments can be found almost 1:1 in the GOS forums from the official account.

Perhaps you should note that the comparison on Eylenburg’s website is not independent. The GOS developers are the only ones of the ROMs shown who regularly actively involved themselves in the comparison, hence features of other ROMs get rarely added: https://federation.network/notes/abj9kh37jzq800dg