What is the problem with this file? Did you simply select the wrong asset or is there a quality issue with the asset?
There is a very large number of layers. It is impossible to do anything about it.
I can confirm that the file will be difficult to handle. However, it is possible for an experienced Illustrator user to clean up the file with a reasonable effort and at least isolate the monkey. But I agree, the contributor should have done that.
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(see also here: https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703 or here