Can you expand on that statement Chuck?
The person in the video said...
" to align with the runway the crab method relies on thrust. "
My understanding of thrust is that it is a force produced by an engine of some type that either applies the force by pushing or pulling.
Therefore in that a glider has no engine it does not have the use of thrust available.
You of course will have to give me some slack in my understanding the physics of flight as I am not a well educated bloke working for a university teaching people how to fly.