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[nablator]

So, if this herbal does split the words using the stem, there is no reason to believe this was impossible in the Voynich manuscript.

There is. What we don't see in the VMS is evidence of vord-splitting where there should be, that would be recognizable because Voynichese is very positional. There are some unusual endings like -cTy, -ss but no split endings -iin, -dy, -or, -ar, -ol, -al. Unusual vord endings like -ch, -Sh, -e and unattached endings (curiously more common in Currier-B) are found in random places, not at the end of lines and before interruptions, where they should be more common than elsewhere.