`_xlfn`-prefix issue with current worksheet functions in MS 365?

I'm using the new dynamic MS 365 worksheet functions, such as e.g. FILTER, CONCAT and TEXTJOIN (together with a spill range reference indicated by the "#" suffix) These worksheet functions work and don't show any apparent error.

I know that in MS 365 a _xlfn. prefix would be displayed in front of formulae that are not supported in the current version. c.f. _xlfn-prefix issue

Displaying the workbook's Names collection e.g. via

Function GetNamedRanges()
Dim nm As Name
For Each nm In ThisWorkbook.Names
    Debug.Print _
        Left(nm.Name & String(20, " "), 20), _
        nm.ValidWorkbookParameter, _
        nm.Visible, _
        nm.RefersTo
Next
End Function

...VBA does not only list the availabe variable names of a workbook, but also (invisible) _xlfn. prefixed names related to the used dynamic functions (including apparently a spill range _xlfn.ANCHORARRAY):

Named Range                 ValidParam   Visible      RefersTo
-----------------------------------------------------------------
_xlfn._xlws.FILTER          False        False        =#NAME?
_xlfn.ANCHORARRAY           False        False        =#NAME?
_xlfn.CONCAT                False        False        =#NAME?
_xlfn.TEXTJOIN              False        False        =#NAME?
SomeVariable                True         True         =Sheet1!$C$1

Question

Am I missing something when I apply the new dynamic functions and does this actually indicate an error? - Would appreciate any valid background information.

Side note

If not only a temporary design this could be used also to check if the current version is run as MS 365.