How reliable Short Sales reporting is we really can't be sure,...

How reliable Short Sales reporting is we really can't be sure, but if we assume it's usually correctly reported, on a timely basis.

And so I find it an interesting aside of following CU6 by keeping a daily watchful eye on the Shorts, which could provide some inkling as to the immediate future direction of the share price. But its fraught with challenges to establish thve actual direction based on the Daily Gross Short Sales (DGSS), which from a broader perspective may give some direction as to which way the Net Short Sales position may be heading, which in turn may provide insight to the immediate future price direction.

May 2 is such a great example of how you might be conflicted as to what the DGSS may mean -
the DGSS was reported as an increase by 998,113 which you'd would result in an increase in Net Shorts for the day. In fact the Net Shorts reduced by 712,925 ie drop from 7.84% Short to 7.61% Short for May 2 ie Short Sellers bought back! And this is reflected in the share price rising from $2.28 to $2.60.

I always look at the Daily price action which I find gives some insight as to what the overall Net Shorts might be for that day, noting there's a 4 day lag to reporting. Of course I've usually got time on my hands each day to follow this, and occasionally might have sufficient time to get a semi-quantitative indication of how that has played out during the day by looking at volumes traded through the day.
For May 2 the daily was quite instructive for me, although what you do with the information is uncertain - I don't day trade CU6 stock at all, it's a long term hold, but it is an interesting aside