Sadly this can be a very true statement.
It was very well known that Miura had lost his way. It was more interested in loli/shota erotica than berserk. His death maybe truly saved this manga.
I can see why someone would say he lost his way. This chapter is not exactly on the level of Golden Age arc though.
I always thought Miura had some inclinations to the sort of thing you mention, but never heard of anyone mentioning it. In the most memorable parts of Berserk those aesthetic inclinations resulted in pieces of dramatic grandeur, reminiscent of late 70's manga (In particular Griffith reminds me of Hi Izuru Tokoro no Tenshi), depravity, erotism and the grotesque... He didn't mind tropes of genre and got the best of both worlds.
But Berserk can sometimes feel like a sugared drink compared to what it was... All those colorful lol!s and elves, the the generously bossomed witches, Farnese having her womanly self-discovery, Isidro taking up space and Shirke floating around since 2000 or so... Every time he choose to give himself time to think what to actually do next by inserting meaningless crap, he inflicted damage on the quality of the masterpiece. We could get straight to the point, with no decrement in boob scenes.