What you read is not accurate. Your FLF does not have a bacterial or any other infection. Damaged leaves can be trimmed to make the plant LOOK better, but doing so has no effect on the plant's health or future growth.
No doubt, yours is reacting to the transplanting that was not necessary. It may take a couple of weeks before it stabilizes and stops losing some lower leaves. Allow the top half-inch of soil to get dry and then water it thoroughly enough that some water trickles through the drain holes. Don't rely on the moisture meter at all.
For future reference, get your plant information on this site rather than from some random online source.