Yes, this is gluten free
Milk broken into parts: the fat removed, the water removed, the solids dried. Separating milk cannot introduce a grain protein that was never in it, so all of these are gluten-free. They appear on labels in this fractioned form because powder is cheaper to ship than liquid, not because anything has been done to them that somebody with celiac disease needs to know about.
anhydrous milkfat is covered by CiCi's entry on milk solids and derivatives, which share this answer and the reasoning behind it.
Every one of these is the same ingredient. The number of names is a large part of why gluten slips past people who read every label.
Point CiCi at the barcode on the product you're holding and get this same reasoning in about two seconds, plus the carbs and the full nutrition panel. 360,000+ packaged foods are already read and waiting.
This answer comes from CiCi's ingredient lexicon — the same rules the scanner uses, not a separate article. Where reputable sources disagree, CiCi takes the conservative position and says so.