By "squash", they must be referring to summer squash. 3 plants, when in full production, would be enough to keep a family of 4 fed with some surplus for freezing/canning. Of course, they would only be in full production for a month or two until the combined assault of the squash borers and squash bugs takes them out.
For winter squash, which is easily stored, you can plant a lot more, ideally enough to keep you in winter squash until the next season's crop comes in. I am still feasting on Seminole squash from last fall's crop and still have 1/3 of the crop left in storage to go. This squash can be stored for a year, and this season I will be planting more than the 2 seminole plants I grew last summer so I will have enough stored squash to keep me going through late summer when the next crop comes in. In my location, 1 seminole plant will produce 80 squash fruit.
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