You don't need to have “anti colonial” tag to speak about Palestinian children being slaughtered live on front of your eyes.
Also i disagree that all their fans are white men (whatever the fuck that means), i think Metallica is or maybe was a big global band that have enormous fanbase all over the world (literally).
The message the article tries to deliver is basically calling out fuckface Hetfield, as he is going political (in a negative way) with his recent pesudo-love and anti-politics rhetoric.