Big Blue
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This is a popular and persistent myth. Ask any gardner about insect problems with cycads. Our own potted Stangeria (a cycad) has a persistent problem with scale-insects. There *are* gymnosperms which provide sufficient nutrients for their pests, and and see no reason to think that the same could have been true of extinct species.
You also need to remember that there is a WIDE range of extinct gymnosperms that do not belong to any of the living groups, and for which we have no knowledge about nutritional value. There were also lots of ferns, and apparently some of these ferns occupied the niche now filled by grasses
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