Rekordbox 6 internal recording level and library

Hi! With the new v6 is the internal recording level fixed by now ?

A guy earlier examined professionally and drawed attention about it with examples. you can find it here:

https://forums.pioneerdj.com/hc/en-us/community/posts/360055368452-Rekordbox-V5-8-AUTOGAIN-is-very-good-LUFS-measurements 

I tested this too and got the same results with the latest v5. Any under the hood improvements in the v6 made ?

Furthermore,from the FAQ i can't get it clearly. Can i migrate my examined library to the new rekordbox ?

Also is the v6 enables the Guest USB history by now ?

Thanks!