I don’t think it is from NSI. No commit message in the last 2 weeks mentions Elizabeth Line, London Underground or TfL.
Another automated edit by this user set operator:type=private on Great Ormond Street Hospital, which was from NSI (fixed in Update hospital.json - NHS trusts are operator:type=public, not private by rskedgell · Pull Request #10909 · osmlab/name-suggestion-index · GitHub ). This would be obviously wrong to anyone in, or with adequate knowledge of, the UK.