Noticed elsewhere and duplicated here:
In the last month or two the URL format for posts (“url” column in the CSV) has changed. It used to always be https:// now it is http://.
Probably related to the change where email goes out with all the URLs as http:// instead of https://
That would put the date on or after June 30th and on or before July 6th.
(This is happening to email from Let’s Encrypt:
A brief summary of <a href="http://community.letsencrypt.org" style="text-decoration: none; font-weight: bold; color: #006699;; color: #0088cc" >Let's Encrypt Community Support</a> since your last visit on