Well she did the swab for the PCR and for the lats herself and she tried 3 different types of lats and they were all negative, whereas her 2 PCR's were positive. There have been lots of reports of lat tests not being able to pick up this new variant which is why they say if you have any symptoms even mild ones you should go straight for a PCR.It could be dependant upon how good the swabs were taken to be honest
Personally, I think it's quite irresponsible of both Lydia and Josie to openly show on their vlogs that they are once again not following the guidelines but both think they are the exceptions to the rules.