I would say it means strong but with an implied sadness, but you can have positive poignant memories too - you’d just have to state they were positive. The day I graduated from University was poignant because it was the end of an era and the start of another, but it doesn’t mean it is a sad memory.
In hopes they read this comment - the problem is your price. $100 a year is about what I pay for membership to The Guardian - a highly respected, award winning newspaper, that gives away ALL its content. Why would I pay the same for tech news that covers a fraction of all the news out there?
At $5 a year I would have signed up after reading one good article - at $10 maybe after a couple of good articles - but at $100? Never. Even if you were the only good tech news site - and you are not.