No, this is terrible advice. Companies have hr and recruiters for a reason, if you jump over them it just shows you're pushy and impatient. If someone calls me and tells me their email bounced I'd immediately think they were lame. Seriously? "Did you get my message?" Is circa 2001. These days if an email bounces you go back and read sent it properly with th right address. Emails don't bounce on their own. When I lost a job posting I expect the candidates to be screened by the recruiter. If a candidate calls me I'd just put them in touch with the recruiter.
Maybe others like this pushy attitude but it wouldn't work in my company.
Don't listen to this guy. Building relationships is a huge part of how you go grom one of the massive pile of mostly crap resumes to someone who can skip that and get a warm interview. If you have spoken to someone and they remember who you are, you have a relationship. If you develop relationships with people who might hire you later, maybe they don't hire you, but maybe they can introduce you to someone who will.
The EV of contacting people like this is high. You should do it.
I agree with what you're saying, but does this approach scale? What I mean is: (say) Google gets millions of applicants a day. If all of them start calling up Google devs wouldn't that waste a lot of their time? (I guess a reason why this works is that not many people are doing it)
On a related note, I've found that I get a lot of benefit just by calling and speaking to a real person. For instance, an airline representative once saved me nearly $800 on an offer that was not mentioned anywhere else
You only skip the HR process if you have a pre-existing relationship with a decision-maker in the company. Cold-calling can work, but the most likely outcome is getting black-listed if they think you're one of the crazies.
If you really do want to go the cold-call method, use the cold-call to establish a relationship (i.e., ask for career advice, to talk about their technology stack, etc.) Once you have a real connection, then it may be appropriate to give them your resume.