What these guys are talking about is something else. They are talking about the security of the security services, their own self interests and the status quo of enmeshed relations between three letter agencies and a few captured tech giants.
On the contrary, the exact opposite is true. National security is best served by a diverse, pluralistic, open, heterogeneous tech industry. There is no reason intelligence needs cannot function properly with such an ecosystem, but it would have to do so through the Rule of Law, and systems of warrants that the incumbents have sought to bypass this last 20 years.