I hope the moderators can remove these posts i.e. responding to posts which are not part of this thread and have no bearing on the OP or their predicament.
But before they and perhaps this go, ipvaid you are on the wrong track. There are two separate issues in play at this junction:
A no left turn from Wimbledon Parkside into IPR; and
A separate HGV weight and PSV restriction on IGR itself.
The signs are not a pair. Indeed the ban on PSV in the second is odd given that 'local buses' are an exception to the first, which might raise issues regarding the restriction in 1, but IMO this can be examined without the confusion of 2.