I don't think it was an awful call at all. I think it was a tough call, even for a regular ref. If the ref would have called it an interception, Seattle fans would be PO'd. It was a simultaneous catch, and a tie goes to the receiver. So my opinion is that Tate was correctly awarded the TD. It was clearly a tie, so if they didn't give Tate the TD, then you're being subjective about simultaneous possession. Besides, the call was upheld by a non-lockout, regular replay official.
That article (if that even qualifies as an article), is complete garbage. It's just a bored blogger digging up the past looking for someone to blame for GB blowing it. But I think GB fans are smart enough not to blame Seattle for them not getting the #1 seed. First, they should have scored more points against Seattle. Second, they shouldn't have choked against Minnesota. Thirdly, they shouldn't have lost other games. To blame the entire outcome of their season on week 3 is pretty weak.