It was the means towards their goal at the very least. These people could be maintaining a private archive of this software and other material in a temperature controlled room to preserve it until copyright expires. The legal paths of archiving exist, but these people choose to do it illegally often knowing that other people are going to down and use the software.
>The abandonware crew did all the preserving, without them there wouldn't be anything to release
Usually there is a copy or backup somewhere. Just because a pirated copy is more accessible that doesn't mean that pirates should get all of the credit.
>and it's wrong to claim they did it "to commit copyright infringement"
You are taking this too literally. "Regular pirates" don't want to commit copyright infringement either. It is just the means they achieve their actual goals.
>It also doesn't address that something you cannot play in your lifetime is effectively unavailable and lost to you.
No one has a right to use anyone else's software. I don't have a right to use Windows 3.1 in my lifetime. I don't have a right to play some random game from the 90s that only had 100 copies made. It's okay for software to be unavailable or be lost.