I think that’s what it means, but I’m not too sure. I emailed the same question to London office to ask why my spouse has to do a 2nd medical check and this is why I got a reply from the officer......
“Thank you for your email. Please note, although your medical clearance is valid to 13/3/20, this means your permanent residence visa can only be valid until 13/3/20. By the time you have submitted your passport to your nearest Visa Application Centre, your permanent residence documents have been issued and your passport is returned to you via the Visa Application Centre, this would not permit you sufficient time to book your flights and travel before the expiry of your visa. Therefore, when there is less than 3 months of validity left on medical clearance when we are ready to make a final decision, our procedures, for good client service, are to issue new medical instructions. I hope this explanation will help you to understand why we requested a new medical clearance from you.”
Mind you not everyone gets 2nd medical, but I guess I did. BTW did you try to email the London office to ask what’s going on with your case?