In any case the mandatory reserves are not a big chunk of "banks money", but it is also not nothing. 2%. The biggest banks will "loose" between 100-150 million czk (4 to 6 million euro) monthly compared to what they got before.
Not sure if that's alarming. The banks will just lower the deposit rates for plebs and bob is your uncle. There was a drop in the bank stocks, not sure if it's going to last.
Is it easing? Dunno, I'm no expert. But it looks like it is less money being pumped out into the economy. It is fin. repression in any case, the inflation is around 10% and what you get on your savings account was around 5-6% before this step.
https://nitter.net/LukasKovanda/status/1700180658683891787#m