Yes, of course. The poster is sharing information that shaped their opinion. The location is irrelevant.

In such an informal setting, the quality and worth of the source are up to the consumer; particularly when it is such a simple investigation. Do you trust or distrust the source? That belief guides your consumption of the poster's opinion.

Don't think of it as being an authoritative source. "While we're having this discussion over here, another group had a similar discussion and reached these conclusions" is valuable input just the same

Some subreddits are better than Wikipedia.