You are talking about surface tension. The importance parameter is speed not height and “like concrete” is a drastic simplification as both behave very differently on impact.
Notably whereas high divers have reached speeds of 60 mph the Artemis II splashed down at around 1/4 that speed a speed you too can obtain by jumping from about 10 feet up.
ptu@sopuli.xyz 1 week ago
Due to its low density and viscosity, water cushions the spacecraft enough that there is no need for a braking rocket to slow the final descent
en.wikipedia.org/wiki/Splashdown