Yes, I'm a bit confused by this too -- I'm taking my girlfriend in October so was disappointed to see some websites listing Adventure Isle as being closed from August through to April, but I've not seen anything about this on twitter this month and no updates on what is being done - if anything- and it's not listed on dlrpmagic's refurbishment list.
There were some bits about the Pont Suspendu being refurbed that I spotted, but that's open again now, so could it be they're just closing certain bits of the area off throughout this period while leaving others open? or is it just that some websites have got it wrong?
It's not a major attraction, so it's not the end of the world for me if it's closed off, but it's a great place to explore when the queues are busy so it'd be nice if it's there!