Obviously it helps, but without segwit LTC would have no selling point. Who wants a BTC clone with prospects to get anything new done? that was LTC before segwit. In this post-segwit reality, LTC can shine to unforeseen prices thanks to what segwit being activated means, this creates a big bullish pressure that Coinbase can cater for.
But of course, anti segwit FUDsters will never admit segwit drives the value of a coin up objectively speaking.