fixed-pitch fonts don't scale in org mode

[jolitp]

Following the Emacs From Scratch series, when reaching video 5 on org mode.

Using the following code:
` (set-face-attribute 'org-block nil :foreground nil :inherit 'fixed-pitch)
(set-face-attribute 'org-code nil :inherit '(shadow fixed-pitch))
(set-face-attribute 'org-table nil :inherit '(shadow fixed-pitch))
(set-face-attribute 'org-verbatim nil :inherit '(shadow fixed-pitch))
(set-face-attribute 'org-special-keyword nil :inherit '(font-lock-comment-face fixed-pitch))
(set-face-attribute 'org-meta-line nil :inherit '(font-lock-comment-face fixed-pitch))
(set-face-attribute 'org-checkbox nil :inherit 'fixed-pitch)

`

And using the hydra keybinding set in earlier videos, the "toggles" "scale text".
The zoom only affect the variable pitch fonts, the fixed pitch stays the same.

by commenting the above snippet I made the whole text scale together, but there are no fixed-pitch font anymore, which is not what I want.

Any Ideas on how to solve this?

you can see the whole config here