Bum coding on the part of the originator
Your quite right QRTXX indicates Tempo Restricted Area and you should read the text for details.
For the unitiated the decode is on
the UK AIS Website.
Of course a note to ais.supervisor(at)nats.co.uk will get it sorted. (In double quick time too today as they are being audited by their regulator)
Now who was it who said the French did NOTAM much better than we do?