"Roadmap" -> plan, strategy
"Structural change" -> internal reorganizing, lay-offs
"Nimbler" -> fewer employees, which we hope will make us become more agile
"Streamlined" -> ambiguous and essentially meaningless by itself
"Impactful" -> revenue- and/or growth-generating, maybe "important"
I'm as much a hater of overuse of jargon as the next person, but for his intended audience I don't think this is an example of that. If one doesn't know what any of those words mean, then "Hello, welcome to Hacker News."
It's like the difference between legalese and regular English.
I'll give you "structural change" though, which I think is just a euphemism for layoffs.
Legalese is also more precise, but also violates the "give it to you straight" principle.