Also "work from home". I'm guessing something flooded the job boards in the last month with a single term (think something spammy!), combined with a seasonal downturn .

Also, tax. Is it seasonality? Is it a bigger trend in expansion of non-tech jobs? Is it more non-tech jobs getting posted more widely on job listing sites? Is it indeed.com indexing more sites that favor non-tech jobs? Is it something else? Is it a combination of some of these?

Really hard to tell.

Certainly not a strong basis for suspecting a tech collapse of any sort.