Presumably the author used a WYSIWYG editor in the first place because he is not a technical person, so for him/her to now not only learn enough HTML/CSS/javascript to turn to hand editing but to also understand Frontpage's noisy output would probably take enough effort that they might rather decide to shut down the site if they're not able to continue using Frontpage. Hiring a dev to redo the site is another option but that presumes they have enough money to invest in a hobby site...
Nah, I don't think this is such a big deal. Adding a row to a table is much easier than creating a table from scratch. And Frontpage's output isn't that noisy -- I had to go through that experience myself. That said, my old Frontpage from 2005 (which I copied from Win XP probably) still works fine except for a warning it throws at start about not finding some registry value. I wouldn't want to use it any more (it doesn't understand CSS and screws it up), but if I wanted, I could.
ironically, i bet the author has learned more technical skills by maintaining a system that can continue to run their version of frontpage than they would have if they had just taught themselves HTML from the start.