With the users this game had in the past, I can guarantee thousands before you have tested ModAPI, and as sketchy as it may appear, it doesn't seem to actually be malicious, even if a lot of the available mods for various games can be used maliciously in their respective games.
It's used incredibly often here, whether others like it or not since there is also no anti-cheat in this game and the only effective way to combat the mods is with other mods. If you search these forums for 'griefer, cheater, hacker, or modder' its all the same, people complaining about the commonality of ModAPI users utilizing the available mods exclusively to troll public servers. To that end, I have to begrudgingly agree. I don't really mod but I think that what 2High2Tell was trying to say is that while you may not be familiar with ModAPI, several in this community (and others) are and have been using it extensively over the years without issue, so it's unlikely that you would have issue either if you do require their loader.