Because he's in CANADA - Duh!!!
Further North you are, the longer after sunset it stays dark in the summer.

At my location - almost 55º North - it NEVER gets fully dark from 9th May, through to 4th August.
And this is PERFECTLY NORMAL
8th May, sunset for me was at 8:52, and it didn't get full-dark until well after midnight.

Check the data yourself at a site such as this:
[link to users.softlab.ece.ntua.gr]
For my location at 54.6º North - 9th May:-
Sunset - 8:54pm
Civil Twilight - 9:39pm
Nautical Twilight - 10:42pm
Astronomical Twilight - Doesn't occur - it never gets fully dark at any point during the night.

Civil Twilight is only moderately dark - Nautical twilight is quite dark, and is what most people would consider as 'night-time' - Astronomical twilight is properly dark, dark enough for proper deep-sky astronomical observing.
As you can see - at 54.6º North, on May 9th - 'civil twilight' comes about 45 mins after sunset. Civil twilight is not very dark at all. Nautical twilight doesn't come until 1hr later, so you see, it's perfectly normal for the average person not to consider it to be 'dark' for well over 1½hrs after sunset, at northerly locations, at this time of year.

That guy in Canada (quite far North) notices it still isn't dark, 45mins after sunset....
That is NORMAL.