Loads of companies have deferred revenue including building...

Loads of companies have deferred revenue including building companies, consultants, accountants, retailers etc etc. Deferred revenue is for good and services that have been paid for but not yet delivered. If the goods or services haven't been delivered the majority of the costs would not have been incurred either.
This will probably be normal practice for this company going forward. Makes perfect sense really, why would you want to potentially include that in your taxable income if its for services to be delivered at a later time.