I do not have any info on this job, but I have the very likely solution/explanation: it WAS a 1099 job, but someone challenged the "independent contractor" status of the job with the IRS, and the IRS agreed. Whether anyone agrees with it or not, just calling someone an "independent contractor" doesn't make them one anymore than me saying the sky is green. I mean, some of the criteria they follow include scheduling, location, and ability to hire your own assistants. As such, if the IRS disagreed that the specifics of the job were that of an IC, and much more closely coincided with employee status, then they would make that ruling.
Now, a W2 job with no bennies? Well, whatever. What it DOES get you is the half employer tax contribution, unemployment insurance eligibility, and worker's comp. However, if you are not bringing your own laryngoscopes, BVMs, ventilators, and drug box, don't book your own OR time whenever you see fit, and have a non-compete, you're probably not an IC.
Now, don't shoot the messenger - it is what it is. I'm just saying is all.