Mourning customs during the counting of the Omer

peace,
I wanted to know if in your opinion there is really anything to what Rabbi Chen Shaulov said and whether the prohibitions on counting the Omer are really nonsense or whether we should continue to act as we are used to (with mourning customs).
Link: https://youtu.be/C_Y9sTQPmtU?si=PzrRe3OMuNj2cooT
Thank you very much.