The linear-B texts containing some form of a Greek dialect are from the fifteenth century. I have read somewhere. They are from Creta and some other places so they are a bit more in the South and may not be representative for other places. These things have not much to do with the troian war. The Balitic things looks to me as a recycling of older ideas about how certain indo-european languages may originated once. Recycling of old ideas is a good indication for a missunderstanding. Missunderstandings are in itselves interesting though. We can learn a lot from them. This has also been the intention of the OP.