Please don't take the parent too too seriously, they listed some fairly useful technologies that are widespread but some that are definitely more situationally needed/niche. I think they were speaking somewhat jokingly/ironically if you couldn't tell (listing 3 relational databases for example as if you need to have experience with all 3 rather than just _any_ relational database).
In that case I think you perhaps overstated what is necessary to get a US government job. Or to get a software engineering job in general. I get paid GS-15 level as a civilian and I've never touched Oracle DB, Tailwind, Rancher, or some other technologies you mentioned. Perhaps you didn't mean to imply a person need to know all those things to get a job, but it came across that way to me and I disagree.