They said it's necessary, not sufficient.
I have a couple dozen open roles right now, at a 50-person company. Each posting gets thousands of applications. Most are fakes, or AI-generated, or AI-generated fakes. Realistically, we're going to respond to 1%, maybe 2% of them, because again, 50-person team. Half the time, you get someone named Ralph McGuinness on for a quick code screen and they have a thick Mandarin accent or something equivalently implausible.
The best first filter we have at the moment is to programmatically toss out any resume that doesn't have a LinkedIn, that has a hallucinated LinkedIn that doesn't resolve, that resolves to a name that doesn't match the resume, that has no connections or history, etc.
It's an absurd state of play that hurts those of us trying to hire and those of you trying to get hired, but also a trivial hurdle for you to clear, so stop arguing and just do it.