It appears from the video that they bombed the electrical generators on top of the dam along with a substation off to the side.
No attempt was made from the video at destroying the dam itself.
I hate Putin and Russia as much as anyone, but there is no reason to lie about what they are doing, when there is so much that they have actually done that is horrible.
There were so many photos at link. Hopefully, these few will help:
Pictures released by Maxar Technologies show damage to sections of the northern part of the dam and sluice gates after the explosion
Russian troops destroyed a key Ukrainian dam before fleeing Kherson dressed as civilians in the latest humiliation for deranged despot Vladimir Putin VIDEO https://videos.dailymail.co.uk/preview/mol/2022/11/11/762100390369212323/636x382_MP4_762100390369212323.mp4