Absolutely false. Screen time is an excellent way of exposing the child to a language and thus learning to distinguish the phonemes that make it up. It can be argued that screen time alone doesn't help too much in learning to speak a language (if by screen we mean a non-interactive one, of course). But it's great for listening comprehension.
Source: starting when she was a baby, I let my kid watch as much TV as she wanted as long as it was in English and not in our language (Spanish). She watched about 2 hours a day, on average. Her mother and I are quite fluent in English and, even though we rarely speak it among us, we encouraged our child to learn it this way, occasionally answering her questions or translating the words that she couldn't figure out by herself. She's now 6 and speaks it pretty well, she can easily maintain a conversation and she is very good at identifying the correct phonemes while listening (even in the cases when she may not know the word). Actually, she's better at listening comprehension than what her mother and I could ever hope to achieve ourselves. Differentiating phonemes is a crucial ability that is learnt optimally at an early age and after only a few years old it cannot be learnt that well (I remember reading an article about this limitation in Scientific American more than 20 years ago, I don't have a link for that).