Read a post recently ...
You may have read it recently, but it won't have been a recent post.
Scatter Lasers used to give twin-linked to anything fired from that model afterwards. That was in the old codex, and is not in the latest codex.
The 1D6+1 is the amount of shots a
WS shield used to be able to fire.
Again, this is in the previous codex, and not the latest version.
If you get to know when codexes were published, you can work out whether the posts you read are still valid.