Quickly strike-through a whole line in org-mode tables
If you put the point at the beginning of the line you want to strike through, you can use the following replace-regexp to strike through all the contents
C-M-% ;; Query-regexp-replace
" +\(.+?\) +|" RET " +\1+ |" ;; Strikethrough all content up to the next |
Then only do so for the length of that line (If you select the line first you can perform on the entire region with !.