That's from Indeed. And, Indeed has fewer job postings overall [https://fred.stlouisfed.org/series/IHLIDXUS]. Should we normalize the software jobs with the total number of Indeed postings? Is Indeed getting less popular or more popular over this time period? Data is complicated
Look at that graph again. It's indexed to 100 in Feb 1, 2020. It's now at 106. In other words, after all the pandemic madness, the total number of job postings on indeed is slightly larger than it was before, not smaller.