It makes a lot easier to develop addons or compatibility for mods if there is a deobfuscated, but compiled version of the mod to add as a library. To build a deobfuscated file as the output, all you have to do is add

task deobfJar(type: Jar) {
    from sourceSets.main.output
    classifier = 'deobf'
}

as the next task after javadocJar and addArtifact deobfJar to project inside curseforge

Use the normal jar.