In the Databank : Max Intraday Drawdown calculus is made on the full period only

In the Databank column  : 

If you select the In Sample "Max Intraday Drawdown", the  calculus is made on the full period only.

It looks like you have the IS results , but in reality you have the Full period calculus

In this example:  the In Sample period is from 2017 to July 2018 included .

but the IS results will include the OOS results of August 2018 to december 2018 (as you can see on thee capture attached)

I attached a strategy, without the OOS period and with the correct results, and the same strategy with OOS with IS Max Intraday Drawdown (with incorrect results)