It is a reality that the "glassy water" technique of landing, which would also be very appropriate to unbroken snow, is not possible in a power off approach. The whole premise is that you're going to drag the plane along with power, in an attitude where touchdown is safe at any point along the landing path - 'cause you don't know where it will be. When you land "glassy" probably about 10% of the touchdowns will be well before or after you expect them.
A water flying hazard is planning to touchdown in the rippled area of the water, and overshooting onto the perfectly glassy area. You my still have lots of space to land ahead, but your approach must instantly change from power off to power on. Usually, a go around is the best way to handle this, because there is a huge risk of unintended touchdown while you reconfigure the aircraft.
Unbroken snow is really no different in this regard. The best hope you have if things line up, is to land in a direction where the pilot can see the shadow of the plane on the snow - sun from your 5 O'clock position. That will work fairly well, if you can set it up.
If, as I might have missed, for not listening to the audio track, this was a forced landing, it was a very difficult environment, which the pilot might not have anticipated. But the facts of the lack of visual cues to the pilot are the same in any case. Avoid low flying over featureless surfaces, if at all possible. Fly near shore, trees, animal or snowmobile tracks, anything which will give you a visual cue as to your altitude.