Different wording here:-
https://www.mvt.org.uk/copy-of-membership-join
Airsoft / Deactivated weapons
Membership of the MVT, and Public Liability Insurance may NOT cover the purchase or use of airsoft / replica weapons.
It is at the discretion of the dealer if they acknowledge MVT membership suitable for the purchase of a replica weapon.
Having read Simon Bromley's clarification in andym's post it looks that the confusion would end if the 2 "Airsoft/ Deactivated weapons PLI notes" are both changed to give the same information as in the clarification.
Also, I have emailed Tim Hawkes the MVT Safety Office in case he hasn't received my PM asking for the definitive answer.