I looked at 4 references under Ipuwer, and they all speak of Ipuwer’s writings as being centuries before the papyrus that was found. The papyrus was found around the time of the 2nd IP which was also before the time of Exodus. I am sure Egypt has had more than one emergency that turned the river red with dust or algae (phisteria) that was toxic to man and animals.
http://www.ancientpages.com/2017/08/07/ipuwer-papyrus-report-ancient-catastrophe/
Below is an interesting evaluation of the 1st IP as a period of cultural change when wealth and material goods became more commonly available. Ipuwer is evaluated as someone lamenting the fact that the kings, etc. had less absolute power and therefore order than during the IP. Also that he wrote decades after this period in a state of nostalgia. There are almost no written records of that period. Some of the dates give in this article seem a little earlier than dates I have seen elsewhere for the same events. Personally, I think some bad stuff really did happen, but did not last for many decades at a time.
https://www.ancient.eu/First_Intermediate_Period_of_Egypt/
The papyrus was found around the time of the 2nd IP which was also before the time of Exodus.
It was found in modern times, wrongly attributed to the 1st intermediate period, but best of all, the document is not that old, so the claim is, that it is a 2nd IP era copy of a 1st IP document. That's not credible. It is so obviously in reference to the events of the Ten Plagues, any connection with the 2nd IP has been rejected to undermine the historical content of the Old Testament.
I am sure Egypt has had more than one emergency that turned the river red with dust or algae (phisteria) that was toxic to man and animals.
That's a fine speculation, but there is just the one written record, and that's Ipuwer's. The faulty dating was accepted by Donovan Courville ("The Exodus Problem and Its Ramifications") leading him (or helping to, anyway) to telescope the two "kingdoms" (Old and Middle) into one thing.