1) Would you care to name this allegedly high level swordsman?
2) Kendo has little to do with traditional swordsmanship that is taught in a Ryuha, so trying to imply that there is any carryover whatsoever is inaccurate (to say the least).
3) The information/opinion that you shared is (IMO) dangerous and irresponsible. If you do not believe me, then I would be happy to arrange for a teacher in a traditional Japanese Ryu to attack you with a bokken, so that you can experience for yourself, the results of your assumptions.
The opinion you hold is no different to those who I witnessed.
I have nothing more to add.