This is the same deal that's going on for the battle.net for the PC version but for PS. It will expire June 25th, 2025 (Wednesday).

Diablo II: Resurrected is the definitive remastering of Diablo II and its Lord of Destruction expansion - two hallmark entries in Blizzard Entertainment's genre-defining action role-playing series.
Veteran players, as well as those who missed out when the original game was first released on PC twenty years ago, can now experience Diablo II's timeless gameplay with modern visuals and audio that take advantage of PS4 and PS5.

https://www.playstation.com/en-us...surrected/