Yes, the average is over the last N shares -- which is a long time as currently the hash rate is low. Changing the shown hash rate to a fixed interval has been on the TODO list for a long time. But for now, just let the miners run a few hours and you will see that the shown hash rate is correct.
Hope we will find the first block soon

Just FYI, I changed it a little bit and instead of using hodlminer.exe -o stratum+tcp://roi.optiminer.pl:5000 -u HODLADDR -p x I added -q which makes it cleaner for me.
I am using basically hodlminer.exe -q -o stratum+tcp://roi.optiminer.pl:5000 -u HODLADDR -p x