Just to throw this out there.
I once ignored the 100v only and ran a DVD player on my 120v line thinking it would be fine only 20% over volt.
Sure it worked just fine... For about 2 months when it then went up in a big poof of smoke.
Sure it was not major but I could not be bothered to even investigate.
Lesson learned I use stepdown on both my Japanese 100v TT now.
👍👍👍 Ymmv.