Many people say this, but it is obviously bullshit. But most things people say all the time is bullshit, so I would not bother with it that much, it's not like people are saying "Programming languages don't matter, see here my affirmation is backed by a hundred statistics and data heavily reviewed and strong literature", it is more like "Programming languages don't matter, well at least I feel like it, the same way flowers smell like blue or something".