If there are no manual excerpts added to the Post, WordPress picks the content itself as excerpt for that Post. You may either put the excerpts for Posts manually or apply_filter(‘the_excerpt’, ‘modify_excerpt’) and remove the unwanted text from the excerpt. The function code-structure will remain almost the same, with the exception that now you will want to remove the “Hello All” from excerpt.
I hope this helps; let us know if this resolves your issue.
Cheers,
Ruturaaj.