Removing one whole chapter of my thesis is suggested (required)
It is very likely in your interest to follow your advisor's advice.  The timeline you describe suggests your advisor has been highly irresponsible (or impacted by the current pandemic) about providing timely feedback, but this is not a reason not to do what they recommend.
In academia, you will be judged on your publications, not the content of your thesis.  Removing content from your thesis to please your supervisor will not necessarily prevent you from publishing that work, so the downsides of a shortened thesis are limited.