In the Smart TV ecosystem, many devices include an "OMI" string in their User Agents.

In browser.yaml file you define this keyword as 'Opera Devices'
- regex: 'OMI/(\d+[\.\d]+)' name: 'Opera Devices' version: '$1' engine: default: 'Blink'

I actually don't know what "OMI" stands for but Opera TV was acquired by Vewd in 2017.
Source: https://www.streamtvinsider.com/broadcasting/opera-tv-rebrands-as-vewd

Then Vewd was acquired by Xperi (TiVo) in 2022.
Source: https://investor.xperi.com/news/news-details/2022/Xperi-Acquires-Vewd-Software/default.aspx

After the Opera TV acquisition by Vewd, the system (not sure about the terminology) is called Vewd Core.
The Official Page of Vewd Core:
https://business.tivo.com/products-solutions/smart-tv/vewd-core

The documentation of Vewd Core (version 4.8 to version 4.23)
https://integration.tvstore.opera.com/

The documentation of Vewd Core (version 4.24)
https://developers.tivo.com/

The documentation says "OMI" stands for The Vewd Core:

Another documentation about that references "OMI" and "Vewd Core":
https://partner.zeasn.com/partnerportal/HowtoIdentifyaSmartTVplatform/index.jhtml

As I said before, I am not sure about the terminology but using "Vewd Core" instead of "Opera Devices" seems more accurate based on the references that I shared.