Interesting. Ten different examples of remains recovered from permafrost from a number of different locations dated from 800 years ago to 57,000 years ago. None dated to a period around 4,300 years ago. The closest to that period was the brown bear carcass dated to 3460 years ago. Of course, I'm sure the complaint will be that dating is wrong. That is always the complaint, but it never gets much evidential support. I wonder why?
At first blush, the data on the penguin colony looks pretty wild between 800 and 5,000 years ago. But these are not dates of a single age population of specimens with an overly large uncertainty in the dating. Digging deeper and reviewing the report the article draws from the authors are clear this site was occupied by different penguin colonies as recently as 800 years ago and as far back as 5,000 years. With some of the remains dated from more recent occupations and some from the older occupations. Thus the wide range.
Regardless of knowing or not knowing how these animals died and ended up in the permafrost, the number of sites and the different ages of the specimens is not evidence for a global flood some 4,300 years ago. It reflects a steady accumulation of mammals living and dying over a 60,000 year period and not suddenly all at the same time from some single catastrophe.
While there is nothing definitive indicating how they died, some evidence indicates the wolf pup may have been killed in a den collapse and two of the mammoths may have indeed drowned, with evidence of mud in their lungs. But that is not unusual in the regions of permafrost where warm season melting results in bogs, ponds and lakes due to the low to nonexistent capacity for water to percolate through the permafrost and remain at the surface.
Anyone looking to use this as evidence of a global flood or worse, to use the absence of any definitive explanation for the presence of these carcasses in the permafrost as an argument from ignorance to default to a personal belief as the answer needs to look elsewhere. Better yet, stop looking, since there is no evidence that supports a global flood for any time in the last 20,000,000 years. For support of that, one need only look at another environmental extreme of the Atacama desert.