I think it could be a factor of both as I know it had many emergency exits but all of them as I know had no way of tiring or holding the boats to stop them moving while guests get out and also not sure if the ride can be drained so guests would have to walk in the water.
So I said ages ago Colin and his management team went on Pirate adventure and he gave the money to get the H&S work done and repair broken scenes but a manager at the park at the time stole the money and left the company.
The thing is though. The ride was issued with its ADIPS certificate for that season. We know this because the ride opened initially. ADIPS certificates are like a car MOT. Infact, Drayton have always been very good with their ADIPS, aswel as usually displaying a sticker in public view of most rides, indicating the inspection has been carried out.
Not a single ride, fairground ride or the like are allowed to operate in the UK without one.
The inspections are carried out to make sure rides are safe and they comply with all the relevant H&S legislation including legislation that is due to be introduced a short time into the future if it is relevant to the ride. If the ride needed platform updates and modifications for evacuation, there is no way it's ADIPS safey certificate would have been issued for that season. Evaluation platforms are quite a major safety thing. So if something as major as that was allowed in the pre season ADIPS inspection, we can pretty conclusively assume there is nothing wrong with the platforms.
H&S would not just turn up mid season and decide the platforms need modifications and close the ride, that is not how it works, they would have been signed off in the ADIPS, that means they would have been good for that season, based off the H&S's own legislation.
H&S would however, turn up and close a ride if say some of the scenery had detoriated into an unsafe manor. As the ADIPS inspections would not really pick up on scenery condition as the ADIPS inspections are purely for ride hardware.
So given all this, and considering the fact the ride did open in 2015, proving it did indeed have its ADIPS certificate for that year. It is extremely unlikely the ride closed due to evacuation platforms needed modifications. The fact it had its certificates proves the ride was signed off in that regard as safe, for the entire season. It is as simple as that.
Also, I know they are different countries so different legislation. But, the Pirates of the Carribean rides have no way of holding he boats in case of evacuations. They have to be manually held in place by staff (as can be seen on many evacuation videos on YouTube). It proves there is nothing wrong with that system, if managed properly.