i do'nt know which strategy he uses,but here is the general strategy to follow on inventory days
you can see last three coloums,"actual,proposed and previous"
before 8 pm,the coloum "actual" will be blank and "proposed" will be showing some no.
at 8pm,as inventory data releases,the coloum "actual" will be filled either by a -ve no,or +ve no or by a no equal to no of "proposed" coloum
taking trades,
if the actual data is -ve(coloured red), (as shown in above pict of 7th may),take the long position
if data is shown +ve(coloured green),take short position
and if data colour is black,do not take any trade