Hey Snort,
Definition of flying wedge is ambiguous. However, purely from experience, this would not constitute a flying wedge. The flying wedge is something I have specifically discussed with a couple of Shute Shield referees last year. They say that one player can bind before contact and that's fine, need more then 1 player bound to constitute a flying wedge. Additionally, the rule exists because the wedge creates too much force (three players or more players bound at full speed), and prevents a tackler from having a safe place to put head in tackle. Therefore, the action would need to be forceful for a "flying wedge" to be called. The flying wedge shape is something teams I have played in have used, so something we discussed in detail with Shute shield referees. In this scenario, we see that the players bind when stationery. Hence it is not forceful and from that conversation alone, I do not believe it would constitute a flying wedge.
Additionally, please see below an article I have just found:
www.ospreysrugby.com
With that said, I don't think this video constitutes a flying wedge, and at no point should Barker have been penalised... however... just to make this even more complicated then it already is... Cranbrook could have potentially been pinged for stepping away from the line-out before it was finished.
Because that's what we need here... More confusion.