Is the use of Fheroes2 open source engine legal for runs in this game?

Here is the link to the engine I'm talking about. https://ihhub.github.io/fheroes2/

Heroes of Might and Magic II

Fheroes2 Legal?

Super Mario 64

Paper Mario

Mario Party

Mario Party 2

The Legend of Zelda: Ocarina of Time

Mario Party 3

Mario Kart 8 Deluxe

Paper Mario Category Extensions

The Legend of Zelda: Link's Awakening (2019)

Mario Party Superstars

Speedrun submissions will not be accepted until two weeks after release. Have fun and enjoy the game at your own pace!

Paper Mario: The Thousand-Year Door (Switch)

LeetLeaf