If you're using the wallet you posted about in another thread: https://bitcointalksearch.org/topic/m.27594930 then you've got nothing to worry about. Encapsulated p2sh Segwit addresses (those that begin with "3") have no issues sending to and receiving from non-Segwit wallets.
GDAX's post should be about native segwit If you used Electrum native segwit, I believe you have no problems spending a segwit input to a non-segwit output... so yes, you could send GDAX bitcoin, but you wouldn't be able to receive it from them.
Topic: Post from GDAX staff about SegWit (Read 117 times)
https://blog.gdax.com/segwit-939d88d8fd73
Does this mean you can't send funds from a SegWit wallet to GDAX and vice versa ?
Does this mean you can't send funds from a SegWit wallet to GDAX and vice versa ?
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