Why does it use the past simple tense rather than the past perfect (had been)?
(1) Odenkirk confirmed by early September 2021 that he was back on set filming.
The source: https://en.wikipedia.org/wiki/Better_Call_Saul_(season_6)
Whereas the following use the past perfect:
(2) "They HAD packed the goods by yesterday."
(3) "The good HAD been packed by yesterday."
(4) "He HAD finished writing his timesheet by 6 A.M."
The way I see it, (5) "The goods were packed by yesterday" is as equally correct as (3) with a different emphasis. The (5) emphasizes the state of the goods whereas the (3) emphasizes both the state of the goods (packed) and the action performed by someone (packing).
Here are a couple of examples from the web:
Bayona completed filming on his episodes by December 23.
Pre-production on further episodes began by July 2020.
Why then don't these use the past perfect tense?