Back when I was job searching, my response rate applying to posted jobs was on the order of ~10-20% depending on the year. So, clearly these posted jobs are not desperate. A lot of the posted jobs are not real (i.e. they want a very specific candidate and will wait or the position was posted but they're not sure if they're hiring) or already filled before being posted (this happens a lot in academics).
I will grant that the job market right now seems better than it was pre-COVID and during COVID. I knew some desperate, unemployed, and underemployed rad oncs back then. I hope we don't get back there. Back then, anything posted on those job sites would get dozens of applications from qualified people, and it was actually a struggle to sort through them all. Yeah, the best jobs did fill through "word of mouth" since good practices and academic places were often getting dozens of unsolicited applications per year. People still complain about how often they get contacted by job seekers unsolicited.
The good news is that I can't give you sob stories currently--everyone I know seems to be employed and reasonably content at various hospital employed or academic satellite positions somewhere in the range of reasonable MGMA numbers (except for some new grads and some known to be bad urban locations). Sure, a lot of people are looking because good luck having any preference about what you want in a job (location, job parameters, lifestyle, etc), and sometimes not living in a location preference or having the type of rad onc job desired remains an issue even if when fully employed at a reasonable salary.
Almost no other medical specialty is like this. The med oncs where I trained got job offers at double what I was being offered and were being recruited from the day they set foot into fellowship. But, if you're coming into rad onc knowing how bad things are and expecting the worst, things may not seem so bad now that it is well known how bad the job market is and things have mildly improved.
I do know one malignant academic place that got so short staffed they were forced to improve conditions and salaries or they were at risk of shutting down satellites. Supply and demand rules this labor market.