The strength of the timber is probably fine. Those thin brackets and putting 2 screws in one hole is a different story…
That timber is probably not fine, as it cures it shrinks, warps, and and splits. Dimensional lumber is cured, and it still warps and splits.
Agreed on the brackets though.
Not all dimensional lumber is completely dry, which is why it warps and potentially splits. There are three ratings: GRN for having an excess of 19% moisture at the time of surfacing, KILN or KD for no more than 19%, and MC15/KD15 which has no more than 15%.
This is not necessarily common knowledge either.
Anecdotally, I have bought soaking wet wood from Home Depot before. It sucked because by the time it was dry enough to use, every single board was as crooked as a politician looking to get reelected.