HydroHALT - How flexible is HydroHALT under joint expansion?

http: www.hydrohalt.com Joint expansion between the ledge and wall is a frequent cause of leaks and the resulting water damage. This video clip speaks louder than words and clearly demonstrates the ability of HydroHALT to accommodate joint expansion. More information on: www.hydrohalt.com

[@positivelysassy4278]

I’m trying to understand what this video is trying to show. I’m a DIY’er cause I cannot afford someone else to do the work. First this is sealing my basement from vapor and effervescent. Would hydrolock work?