In any case, it is also unclear to me whether Larian is actually using this for BG3. The Italian article does not say much, and it appears to be fairly confused about how Warlocks work NOW, so I am not sure how far to trust it (to be fair, the problem may just be Google Translate). My confusion stems from the fact that they say that Warlock does not get an extra attack, but this is untrue due to the fact that blade pact does get access to thirsting blade.
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I doubt it is used verbatim as Larian likely made their changes before the D&D One Playtest was released.
It is likely to be inspired by the direction that Wizards of the Coast is taking the Blade Pact.