I've gotten all my jobs through recruiters on LinkedIn since 2013 yet my first two jobs where I gained experience/built my network further were through my personal network (did startups in DC and went to events; met many tech folks). I did LONG ago get an interview via stalking a hiring manager on Linkedin and she was cool yet her boss was mortified by such action I took. I didnt get the gig in 2011. Times have changed so some hiring managers im sure won't care until this hack becomes like spam where tons and tons of randos start hitting up hiring managers email boxes and or their linkedin invite inboxes.
Personally what would be better is AI finding people in your network who you already know and who are connected to hiring managers by 1 to 3 degrees of separation. Something that helps the number one thing that gets people jobs ...knowing someone and or having a friend or co-worker (former) who knows these people.
Any tool to spam hiring managers whether AI or not will be marked spam which is highly impersonable, ignored and not seen.
While directly reaching out to hiring managers on linkedin might be a good thing nowadays yet with spam tools such as this Linkedin will start marking them spam and they'll never be seen.
Best thing to do to find work is through your own and or friends' personal networks as you noted.. not this IMHO.