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The yellow ones looks like GW Tau. 40k meets Infinity in the design. Not grabbed by it.
How do they look like Tau?
The yellow mech wouldn't be out of place as a Tau battlesuit, even down to the lower legs and feet. The guy on the right armour, long rifle and helmet are very Tau, he's even got a mini Tau drone. Both of the "warcasters'" staffs are very Ethereal.
Maybe in a general sense but big guns, bifurcated feet and big staffs were a thing before the Tau :-)
I read it more of resion being used for bigger figs. And metals for smaller. So maybe resion Jack's with metal weapons?