Backtest using M1 time frame (derived from tick data suite) reliable ?

 

Is backtest using M1 time frame (derived from tick data suite) reliable ?  I mean 99.9% quality ?

For example, MT4 expert. Dark cloud (is in RANK 7 right now).  Dark cloud usese M1 time frame. It shows amazing results over past 16 years !!!

Is it trustworthy ?