Well. The legal complaint was that transcripts don't exist. The issue was that it was prohibitively expensive to resolve the complaint. Now that transcription is 0.1% of the cost it was 8 years ago, maybe the complaint could have been resolved.

Is building a ramp to meet ADA requirements not using technology to solve a legal issue?

Nowhere on the linked page at least does it say that it was due to cost. It would seem more likely to me that it was a question of nobody wanting to bother standing up for the videos. If nobody wants to take the fight, the default judgement becomes to take it down.

Building a ramp solves a problem. Pointing at a ramp 5 blocks away 7 years later and asking "doesn't this solve this issue" doesn't.