No it won't. To me it looks like the socket on the bottom of the genuine Canon EF/EF-m adapter and the 100-400 MkII, it takes a screw in foot with anti rotation locking detents.
View attachment 191189
That design does allow for third parties to fairly easily make an Arca-Swiss foot for the lenses that use it. RRS will make a mint on such a foot.
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