This is a shame. Nurses working in all levels of care are working with higher patient ratios, higher patient acuity and there is a massive shortage of nurses, globally. It wrong to skip dressing changes and falsely document, but I am sure it happens more times than one would think.
Whomever had the time to take the pictures should have used that time more wisely and professionally and offered to help the nurses. It certainly sounds like this was reported by another employee.