I had seen a bigger poster (one of those 'informative' ones with nothing but text that you miss completely unless you are looking for them) on the station window the day before when I happened to be queuing and bothered to read backwards through the glass.
Who reads posters in that position - on the outside window of the station to the right of the ticket machine? No-one!
I would be prepared to put up with the inconvenience of the locked gate if they actually accomplished something by it. But as far as I can see, and I may yet be proven wrong and there may have been some invisible work done, shows a sheer lack of ANY customer consideration - certainly nothing that a meaningless repetition of the phrase like "I would like to apologise ... for the inconvenience caused .." will do anything to absolve.