Some of that list is dubious or positively misleading. The mitigation for the seat firing with the pin in was not the shroud - it should have been designed so that the pin could only be inserted in a safe position (although I have never been keen on pins in the first place).
Every statement on that list can be backed up with hard evidence, it is not opinion. The shroud was not meant as mitigation for the pin, but to prevent misrouting of the straps through the firing handle. What mitigation was put in place once the MoD/RAF decided to remove it? I understand that customers around the world accept Martin Baker seats with shrouds in place to mitigate the risk created by misrouted strapping.
Since Flt Lt Cunningham's accident, improvements to the shroud have been designed by Martin Baker and offered to the UK MoD for the Hawk but were rejected. As of April 2014 two further revised shrouds had been presented to the UK/MoD for evaluation but had not been accepted.
Finally, the gas piston design change on the Tornado was not driven by the shackle issue.
Clearly, you have not read the 2002 QinetiQ report covering the testing of Tornado modification 02198. In addition to what Airsound said earlier, the report makes it clear that,
"Due to the failure of the MBA trial in mid October 1998, the scissor shackle mechanism was replaced with a GS a drogue bridle release system, incorporating modifications to the BTRU and GFTDU"
The introduction of the gas schackle became part of modification 02198.
DV