I believe this research is hugely flawed since it seems to focus solely on bureaucracy coming directly from the European institutions, while it might be true that we as citizens don’t get actually really in touch directly with EU bureaucracy we certainly experience a lot of bureaucracy in our daily lives.
This comes from countries policy and law making who are obliged to implement EU regulations but also are adding their own local bureaucracy on top of it.
While it’s here different in different countries within the EU it certainly feels more often overburden, restrictive and senseless (speaking from my own individual experience in Germany and Netherlands).