Velocity strings are not rocket science.
Arthur Halleran is currently explaining velocity strings in a series of videos. Here is a link with the description from 2007.
https://onepetro.org/SPEMEOS/proceedings-abstract/07MEOS/All-07MEOS/SPE-104605-MS/141628?redirectedFrom=PDF
Fact is, TCF didn't need a new COO, nor did they have to wait that long to get the wells going. AH should have just done some research on the net. But now it is the way it is and many have lost their money here. Even laypeople can find out on the internet that VS plants also harbour risks and that all of AH's forecasts are smoke and mirrors. Now we remaining shareholders can only hope that the wells deliver and do so in a stable manner.