do LinkedIn posts matter

i am curious how hiring managers decide who to hire is it just from the cv or from how many LinkedIn posts you make or from the hard projects you have done

for example if someone posts a lot on LinkedIn but has less projects does it help

and also why do people post so many random things on LinkedIn as for me i have very few posts maybe 4 or 5 in 3 years does that mean i am not a good hire does it mean i haven't worked on anything

curious what people who have hired before think