I just followed your link... over 3.6 million jobs nationwide! :)
Careful with drawing too many conclusions from that. I’m not sure I understand why, but many corporations have open positions advertised that remain open for very lengthy periods of time, to the point that I wonder if there is any intention of filling them, or if the jobs actually exist at all. Governmental job listings are notorious for this.
Keep in mind that figure includes a ton of duplicates. Some firms will have several agencies working on a position, and each will have ad, as well as the original ad from the hiring firm. Plus firms and agencies revise and republish ads, so they will have the same job posted more than once. There is also the fact that an aggregator will show the same job from multiple sites which firms may also be using or may themselves be aggregators. Finally, companies and agencies post “ongoing opportunities” that do not represent openings but are positions they like to have a stack of candidates for just in case.
In other words, the number is not at all accurate.