No, it only means that the unit is not affected by water splashes. For example, in the rain or in a humid environment. Direct contact with water will damage the headphones. If you want completely waterproof headphones, you have to look for protection class IP67. This means: Dust-tight index 6: Complete protection against contact.
Waterproof rating 7: Protection against water penetration when fully immersed for a limited time (1 metre deep for 30 minutes). For example, this one: https://www.digitec.ch/de/s1/product/jabra-elite-sport-in-ear-kopfhoerer-headsets-5941299.