This will be the kind of beanbag, I assume. Not necessarily this brand, though I chose this to illustrate that it's not just those random amazon products. It's essentially an alternative to a baby swing or bouncer. They went through a bit of a popularity boom about 8 years ago, I remember a friend having one and DH was keen on it and wanted one for DS2. It's possible that the nursery had bought them a while before. I expect they are quite cosy and relaxing when they are used properly.
https://www.tuttibambini.com/playtime/beanbags.html
They aren't approved for safe sleep (despite the marketing - the text on the live page has changed, but the google cache says "Tutti Bambini bean bags represent a safe, comfortable space for your baby to relax and sleep."). I also don't think they are really designed for babies of 9 months who can sit up, crawl etc and they certainly wouldn't be designed to be used face down. That in itself is pretty sickening because you'd think common sense would say nobody should sleep face down on a beanbag, much less a young baby.
I'm certain OFSTED would not approve a product like this for sleep in a nursery. It's supposed to be cots with a relevant safety standard, toddler beds or floor mats only. It's not THAT unusual for nurseries to go outside of the "official safe sleep recommendations" because babies don't always tolerate sleeping flat, and use items like bouncers or pushchairs, although they really shouldn't do this, I can see how it comes to be normal practice. There have been deaths in childcare situations where children have been left to sleep in car seats, which have been fairly widely publicised, although I think none in the UK, at least not in nurseries.
Swaddling isn't advised after babies can roll, so a 9 month old should never be swaddled, in fact I don't think any babies in UK nurseries would be expected to be swaddled, since they tend to start at 6 months or older - and swaddling also isn't supposed to be combined with restraints like a harness. Again, being face down AND being swaddled is horrifying. It's just extreme negligence of basic safety not to mention compassion.