It will fit.
"E-ATX" is mainly a garbage marketing term for any board officially longer than ATX (9.6" / 244mm), the only official board size longer than ATX is SSI-CEB (10.5", which is what the AsRock Taichi is), and SSI-EEB (13" / 330mm) which is "True E-ATX" (it has a fourth set of standoff supports) This photo below shows how much room is with the ATX board, 1" / 25mm will not cause an interference fit and barly cause issues with the rubber grommets.
Photo Source
As a Side note, I purchased the B650E Taichi lite, and saved $150 to get rid of all that "Armor" which does nothing. Literally the same board, and is a decent value at $250-280, but terrible at $400.