Answer

Why don’t you raise this as a talkback comment on the relevant column (487)?
It may be that they assessed that if someone goes there, he intends to derive enjoyment. Beyond that, this is truly inherent to bathing at the beach. If he goes to the beach and on the way also sees such sights, that is “there is no other route.” But here it is part of the very nature of the bathing itself. Still, there is room to analyze this.
Remember that rabbis also usually do not permit watching movies and reading books, which I wrote about here, so in their view, for some reason, there is no room for such a leniency at all.
And in truth, in my opinion there is room to discuss permitting it if he does not intend that.