syntax error, unexpected ‘=’ for comments

Hi,
hmm i am not sure, how do you install the snippet?

It is best to just download a raw version of the file here https://raw.githubusercontent.com/simpliko/wpadverts-snippets/master/enable-comments/enable-comments.php, press Ctrl + s to save it to your computer as enable-comments.php and then upload the file via FTP to wp-content/plugins folder and activate the Enable Comments plugin from wp-admin / Plugins panel.

If you are copying the code from enable-comments.php to your theme functions.php then most likely there is something incorrectly copied but i cannot tell what without looking at the file.