I can vouch for this being the case - identical calipers are used on my VW Touareg, and the same issue occurred. The issue is the brembo calipers are made of a different metal to the pins (steel vs aluminium), which causes the pins to react and corrode, essentially welding them in place. I took it to a local mechanic with fresh pins and pads, they had to cut and drill the old pins out before fitting the new equipment! Not looking forward to the job on my Ti when it comes around.... a bit of copper anti seize on the pins where they contact with the caliper will help for the future.Come on not so fast... you‘re just about to have it sorted an can go enjoy again.
(....btw, similar set of calipers are used on other brands and of which I’ve been told they have their flaws as well.)