I just saw this post - are you still having trouble?
You’re getting the tags data at the start, but I don’t see where you’re looping through it. Did you intend to loop through it with a foreach?
So, if your tags are apples, bananas, kiwi, do you want all the posts tagged apples, then all the posts tagged bananas, etc?
You might want to look at how Headline does this - specifically home.hbs. I think it does what you’re trying to do, but maybe I don’t understand what you’re trying to do.
By default, the {{get}} helper will only fetch the basic data of the post, and that doesn’t include tags and authors, that is why your filter doesn’t work.