No, BSU, that's not right - as with a number of related Implementing Regulations, there is disparity between stakeholder compliance and components of the mandate (1207/2011, 1028/2014 and 2017/386 (SPI) for example, where there is a deadline to equip aircraft but no requirement for ANSP's to deploy ground based sensors and therefore properly make use of the data), and the CAA recognises that in the case of types not approved for RNP approaches, there exists
an anomaly between the pilot privileges required and the aircraft capability
The exemption is intended to cover the gap of diverging applicability dates within Commission Regulations (EU) No. 1178/2011 and is therefore time-limited from the date of entry into force on 25 August 2018, until 24 August 2020.
As said by CloudHound, a pragmatic approach by the CAA which is both sensible and proportionate.