[walty]

You can just change the URL to https://www.cs.toronto.edu/~ilya/pubs/ilya_sutskever_phd_the... to get valid https.

[Jimbo_029]

Could you explain how this works?

[nayuki]

The University of Toronto owns both the domains toronto.edu and utoronto.ca. Some sub-sites work on both domains, and some don't. Apparently they misconfigured their servers so that they are using the toronto.edu certificate on a utoronto.ca site.