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While, I think that they may be trying to cover themselves from a legal standpoint, I don't think that the berries are dangerous.

The calcium salt is, highly, soluble in water. Washing them, thoroughly, will be enough to rid them of any chemicals.

To clarify- the chemical is very dangerous. Inhalation and ingestion should be taken, seriously. However, it is incredibly water soluble. Wash them, very thoroughly, and discontinue at the firs sign of illness, should it occur.

Yes, you can hold them till next January. Start the stratification then for a month, then plant seeds indoors in February. Make sure your seeds are of the heirloom variety. Hybrid seeds won't grow true to form from seeds.

Here is help:
https://strawberryplants.org/strawberry-seeds/

We only provide gardening information. We do not sell any products or plants.

This article should help:
https://www.gardeningknowhow.com/edible/fruits/strawberry/thinning-strawberries.htm

It sounds like they have, maybe, too much nitrogen and not enough phosphorus and potassium. This can affect fruit size, quality, and quantity. Sulfur may help, as well.

Here is an article that will help:

https://www.gardeningknowhow.com/edible/fruits/strawberry/growing-strawberry-plants.htm

It would depend on the type of blight that killed your tomatoes! Out of precaution, I would recommend solarizing your bed before planting in it. This article will help:

https://www.gardeningknowhow.com/garden-how-to/projects/how-to-solarize-garden-beds-to-eliminate-garden-pests-in-the-soil.htm