So is it still safe to transfer/receive btc with electrum 2.9.3 or does not having segwit support pose any risk of doing so?
You are ok. Segwit isn't a hard fork, so it's not required for you to have a Segwit supported wallet.
If you don’t want to upgrade to segwit, you may simply continue to use any wallet that has not added segwit support. Even though you haven’t upgraded, you will be able to transact with both users who have upgraded to segwit and users who, like you, haven’t upgraded to segwit.
If you don’t upgrade, you may experience one difference: if someone who has upgraded to segwit pays you, your wallet may not show you the payment until after it has been included in a block. This is a safety feature that prevents your wallet from seeing transactions it doesn’t completely understand until they’ve been confirmed by a miner.
https://bitcoincore.org/en/2016/10/27/segwit-upgrade-guide/#not-upgrading-2