It's possible to enjoy problematic media for parts of it that aren't problematic while still acknowledging there are issues with what you're enjoying. Especially for things made in the past, where societal standards weren't the same as they are now.
I think this is especially true for video games, which have both story/visuals and game play. I could sympathize if someone found the game play of an older game very compelling even in the face of problematic story/visuals. Likewise, I can understand someone not enjoying a game specifically because they find it's story/visuals offensive.
At the end of the day, as long as you can understand that a part of older media would be found as offensive to people today, understand why those parts are offensive, and know that those parts aren't ok for modern media, then you're good.
On the flip side, if you specifically, unironically enjoy these games for those parts, then yeah, you're probably racist.
Edit: and in respect to your other posts here, I'll add this: my understanding is that the mod was specifically targeting only that disclaimer, which means the mod maker specifically disagreed with the disclaimer. That is what makes it racist. If it skipped all intros in the game (which it sounds like it didn't), or if the game didn't have a built in option to turn that disclaimer off (which it sounds like it does) then people wouldn't have as much of an issue with the mod.