The article is talking about full-on lectureships, for example, this part-time role, initially advertised as full-time, according to the article:

>> One of Oxford’s top colleges, Christ Church, which had an income of £42.6m in 2022-23, is currently advertising a stipendiary lectureship in modern European history for £15,244 to £16,983.

For comparison, 15-16k was the range of my PhD stipend at Imperial College London between 2017-22 (I never got a clear answer what it was supposed to be exactly, from the admin, so I had to estimate it from my monthly pay, which fluctuated). It always stayed below minimum wage (so I didn't have to repay my undergard tuition fee loan). That's normal for PhD stipends, but it really shouldn't be for a lectureship.

I believe what you're thinking of is TA work: "marking lab reports or programming assessments". I did some of that, during my PhD. I don't remember the pay rate but it was less than minimum wage and the jobs were part-time and didn't last for more than a semester obviously. That kind of job is, indeed, ideal when you're looking for "a little side income", but a lectureship is supposed to be your main line job, not a side hustle.

Annual National Minimum Doctoral Stipend, currently £19,237 + £2000 London allowance for 2024/25. Doctoral stipends have been standardised across all the universities for as long as I have known (20+ years).

To be fair, Imperial is the best paying UK university by far. Postdoc positions at Imperial pay better than Lecturer/Senior Lecturer positions at other universities.