However there is an oddity on pages 120 and 121 in that Ryanair have 22 aircraft scheduled for delivery in September 2016. Looking at past deliveries to Ryanair for previous autumns, their deliveries of new NGs are not unusual for September and October but normally for about 4 aircraft. It wouldn’t make any sense for Ryanair to take delivery of so many new aircraft (22) all at once and at the start of the low season.
I think you're reading the site wrong. It doesn't show 22 Ryanair aircraft due for delivery in September 2016. It just shows the next 22 Ryanair aircraft, there's no dates or line numbers specified so you've put two and two together to make five.
Planespotters is usually NOT up to date, in general it's quite a poor source.
Each to their own opinion but I've always quite liked the site, far better than Airfleets etc.