Interesting, I haven't really watched Finnish TV past ten years. However it can't be too different from Tiresias, it was tall as well, and pretty big outline. You can see the 90s font here:

https://youtu.be/enNnlLcSl9I?t=90

Edit: Comparing 90s font to Tiresias, I would too like to have that exact font they used in 90s. E.g. big "J" is terrible in Tiresias compared to that.

Neither have I. You are right that they are quite similar but not identical.

Ps. Never thought I'd discuss Yle subtitles at Hacker News. Thank you for your comment! :)