When is it not possible for EU citizens to rely on human rights in their immigration appeals?

The Tribunal in case of  Munday (EEA decision: grounds of appeal) [2019] UKUT 91 (IAC), confirmed that in appeals against residence decisions for EU citizens, the applicant cannot rely on human rights if the appeal was violation of applicant's rights to enter and reside in the UK under European Treaties.  In this case, the appellant could only rely on arguments related to EU legislation and not Human Rights ground.