This hit pretty close to home for me, as I started as a programming oriented PhD and then transitioned into a SV full software engineer over 10 years. I am exactly like they mentioned "Many RSEs started out as PhD students or postdocs who worked on software to support their own project. They realized that they enjoyed that part of the job more than the actual research."
I think the advice in the interview is pretty sound. OSS is a great way to contribute and become in demand.
But the main issue here is that there are not enough RSE's. "If RSEs can get the recognition and rewards that they deserve, then the career path will be that much more visible and attractive."
Here are my two cents:
1) Academia will never compete in salary with big tech (except maybe in the big Ivy League schools). Universities should promote spin offs, help with patents, run regular hackathons and an incubator program. That will give engineers an incentive to at least start their career in an academic lab.
2) Some of the best science happens in startups and org x labs, not just academia. But even here I found there are very few companies that value an RSE. You're either an RS, or an SE and the extra R or E is in title only. They will see you as a researcher who knows a bit of python, or as an engineer who wasted years in graduate school. You will be interviewed as one or the other. You will be paid as one or the other. I've never seen a company appreciate the value of fully grokking or contributing to the researchers algorithms and Jupiter notebooks and then architecting an efficient implementation at scale. You will also be kept in your swim lane. Researcher? Can't touch the production systems. Engineer? Good luck getting a patent application going. If there is a hiring manager out there reading this... please consider making a true RSE interview and role.