Building on @Ian's great question. Can it be used effectively? Yes. Is it always the right thing to do? No. Scrum is based on continuously delivering increments of value that are potentially releasable. So, if the SRE team has that kind of work, then yes you could use Scrum. Even if that kind of work is not all that you do. There is nothing that says Scrum Teams have to account for 100% of their time at work. So if the SRE team can allocate some time each day to satisfy the Sprint Goal created at Sprint Planning then you can do Scrum. But if there is no chance of their being able to work on the incremental value, Scrum is probably not the best option.
The question you linked to asks "Is scrum or kanban really useful for SRE teams?". Sometimes Kanban is a better option for SRE teams but again that all depends on the work that they do and their ability to focus on a specific set of items for a set period of time.