The landing was hard because he lost power. At 4:13 he says "I've got issues with my batteries so I'm going to enter the pattern..."
And at 4:58 he says "...and I've lost power"
Awesome plane nonetheless! They seem to have all the same issues as us more grounded e-folk
Losing power has no effect on a landing - you land with power off normally in a very light aircraft, go stand by the runway at any airfield and you'll hear and see power being cut way up on finals by a lot of folk, especially ultralights who pretty much always land power off.
I have always made glide approaches, with the engine just ticking over doing nothing, and every pilot will have been taught this. Yates made a constant radius approach, the classic WWII fighter, no power, approach, and just landed pretty much as a LongEz lands much of the time, hard and fast, no doubt exacerbated by what I suspect was a pretty high density altitude.
Sure some light aircraft, like airliners and heavier light aircraft, make long, shallow angle, powered approaches, but it's not needed and is discouraged at a lot of airfields because of the additional noise nuisance it creates. The only time I've ever made a powered approach was when flying seaplanes, where landing is a lot nicer if you maintain a slow, constant rate, descent to the water, particularly if it's a still day and the water has a glassy surface, making it hard to see where the surface really is.
Please ask questions on the forum, rather than by PM, as it helps others and you'll get a better range of answers.