I did go to "skyguides" home page, and the offer there is considerably more expensive than the mailing i received from amex: $2.99 for 2 months + 29.95 for an additional 12 months + renewals at the current rate $59.95/yr.
There is a page where you can submit requests for lounge reimbursement: via a form, or online--but you first have to be a member to see these
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I opted for the amex plat card mainly for lounge access (and a bunch of incentives amex offered)--if this works out as advertised it seems to be a bargain and considerably less expensive than the annual amex plat fee.
I'm willing to "gamble" $2.99 and see how a two month membership pans out.