Yesterday, I searched the keyword "Merit Source" on meta, and all the results were old. Most of them were created in 2018.
The forum search feature isn't the best one around, but you can customize it to show you better results. Pay attention to the Message age fields. It's set at 0 and 9999 days by default, so it searches through the entire history of Bitcointalk. Make it 0 and 7, for example, if you are looking for something that was written in the last week. Make it 0 and 31 if the post isn't older than a month, etc., etc. But I would still suggest Ninjastic.space or a google search with "site:bitcointalk.org" followed by the keywords as better alternatives.
