I treat any time on Massive Development as suspect unless cross checked with the manufacturers data, anybody can add a development time.
I hadn't heard of any changes but 12 down to 10.5 is a reasonable change. What results were you previously getting. Try a test roll and see how you get on with the new time.
Leica M2, Nikon D700, Bronica RF645, Leica CL, Summicron 40mm, Rolleicord Va, Hasselblad 500 CM Zeiss Planar, Leica 50mm Summicron V3, Hasselblad PME51 metered prism, Zeiss Ikon Super Ikonta 534/16 & Ensign 820 Special - all gone.