They found that showing the actual beheading was counter-productive (with the killing that followed the Pearl killing, IIRC). It usually takes more than one person to do it, with several jihadis being required to hold the victim down, and is quite messy, even if much of the blood drains off into the ground or is sprayed all over the killers. Also, they often don’t manage to saw it off on the first try.
This was bad publicity even for them and also made them look weak and kind of like a gang of thugs, which is what they are, of course. So since that time, they have not been showing the actual killing, but just the one triumphant jihadi forcing the victim to make a statement and then holding up his head.
Clown Prince nobama is a proven chronic liar. It is best to not listen to him because you are put into the dilemma of sorting lies from truth. The degenerate destroyer is not constrained by truth like a normal person might be. Psychopaths are frequent and good liars.