[marc_abonce]

I assume that they mean sending either a direct Linkedin message or an email to the recruiter or hiring manager.

When I was recently unemployed I started doing that after months of getting ignored by most companies and, in my experience, the only difference is that I got far more acks ("Hi! Sure, I'll take a look at your resume and reach out!") but I got a similar rate of applications-to-interview compared to applying through the official platforms.