Sorry to hear about your lovebird. :( And I know this
probably isn't what you wanted to hear, but I think you should
take your bird to be seen by an avian vet.
Birds do not molt symmetrically. It is a random molt and
feathers from one side do not do what the feathers on the
other side do. If you have any pets with clipped wings,
you'll notice this. When birds with clipped wings molt, their
flight feathers come in randomly. You don't always get the
same two on each side growing in simultaneously.
There are a number of diseases that cause feather loss. PBFD
is one of them, but there are others as well. Besides, the
treatment option that you've posted would seem only to work if
the bird was sick in some way (with a bacterial infection or
something else). It is best to have an avian vet diagnose
your bird and give you the most effective treatment for
whatever might be the trouble.