Problem with remove-if and cl-remove-if

Question

I have a very useful bit of code in my .emacs file which closes all buffers except the current one, and scratch and TeX_snippets.org buffers:

(defun my/kill-all-buffers-except-toolbox ()
  "Kill all buffers except current one and toolkit (*Messages*, *scratch*).
Close other windows."
  (interactive)
  (mapc 'kill-buffer (remove-if
                      (lambda (x)
                        (or (eq x (current-buffer))
                            (member (buffer-name x)
                                    '("*scratch*" "TeX_snippets.org"))))
                      (buffer-list)))
  (delete-other-windows))

(define-key global-map (kbd "C-c m") 'my/kill-all-buffers-except-toolbox)

On upgrading to emacs 28.2 (9) on Mac OS X, it appears that cl (from which remove-if comes) is deprecated. Apparently the functions have been renamed to, in this case, cl-remove-if and is in cl-lib. I made this change in the .emacs file:

(defun my/kill-all-buffers-except-toolbox ()
  "Kill all buffers except current one and toolkit (*Messages*, *scratch*).
Close other windows."
  (interactive)
  (mapc 'kill-buffer (cl-remove-if
                      (lambda (x)
                        (or (eq x (current-buffer))
                            (member (buffer-name x)
                                    '("*scratch*" "TeX_snippets.org"))))
                      (buffer-list)))
  (delete-other-windows))

(define-key global-map (kbd "C-c m") 'my/kill-all-buffers-except-toolbox)

but nothing happens when I hit C-c m. I have seen it suggested the (require 'cl-lib) is required -- adding that to .emacs makes no change. What am I missing/doing wrong? This is an extremely useful function for me.