I'm using them this year and don't have the problem; but, if that's the only thing different this year, I would be suspicious also. If your seedlings are indoors where else would they have come from? Why don't you email the company?
I have never used coir pots before so I don't know too much about them. I do know that they come from coconut husks and if your pet gets hold of them, it is really bad for their system as it may kill them. I kind of stay away from them as I have pets. As for the aphids, I am quite sure it may be a coincidence.
This is the first year that I have used the coir jiffy style pellets, the ones that expand when the get wet. At least half of my seedlings have aphids all over them. Would these pellets have brough aphid eggs in, or is this just a bad coincidence. This was the only thing that I have done differently this year. Usually I just use a peat based seed mix with reused trays and pots and have never had this happen before
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