It’s still there, just hidden and not easy.
https://m.facebook.com/help/224562897555674?helpref=hc_fnav
You have to “log in” and click the “let us know”.
Then you have to click through multiple “do you really really want to do this” pages.
"If you don't think you'll use Facebook again, you can request to have your account permanently deleted. Please keep in mind that you won't be able to reactivate your account or retrieve anything you've added. Before you do this, you may want to download a copy of your info from Facebook. Then, if you'd like your account permanently deleted with no option for recovery, log into your account and let us know.
The deletion process begins 14 days after you submit your request. During this time, your account is in a deactivated state and you can choose to cancel your account deletion."
I tried it. It doesn’t work.