Yes, drinking cider from pewter is a no-no. Even modern pewter, which I believe contains antimony rather than lead, is still dodgy. Antimony is still poisonous but harder so doesn't generally leach into the drink as much as lead but because cider is so acidic it will dissolve some of the antimony. That's what I'm told anyway.
In my earlier cider drinking days I had an old pewter tankard that I'd bought at a second hand shop. I was at Sidmouth, where my consumption of cider over the week (in my young, free and single days) I once worked out to be something like six gallons. On about the third or fourth day I went down into town and was complaining in the pub that my head felt dizzy and my fingers and toes were tingling. someone said "What are you drinking in that tankard?" I said "Scrumpy" and he or she said "You've got lead poisoning!" I gave up the tankard immediately and the symptoms went away. Now I always drink it out of pottery tankards or glasses.