Jim,
My experience is with winch launching. Have done it for many years in
Europe.
By looking at the video, the climb angle is way too shallow, at least
of it were a winch launch. The chute opens while following the rope
after initial lift off.

Following the rope is never a good idea unless you're going to
release. At least with winches.

Right after lift off, one should start climbing gradually and increase
the angle once more than 100ft. That way the rope tension stays firm.

If the air speed should become uncomfortably slow or remain too slow,
you can release safely at 100ft or more. Height = safety - even when
slow. So you always want to get some air under the wings and keep the
rope tension up.

By pushing the nose over even at low airspeeds and then releasing, you
won't stall and land straight ahead and see why the speed was too low.

But following the rope on initial launch for more than 2-3 seconds
because the speed isn't high enough, is not proper technique, at least
not on the winch and I would say probably on a car tow as well.

Either release immediately and abort or gently climb out for the first
100ft and then release if speed remain too low for comfort.

Ground launch requires very quick reaction without any hesitation.
There for it requires a plan of action firmly in place ahead of time
that needs to be followed during launch. If the pilot is prepared
properly and knows how to react given the situation, I think it is
much safer than aero tow.

Once you're over 100ft, nothing much can go wrong.
Tom