On FutEnFol's blog, under the article "Les ummites et les crop circles", there appears this new comment signed by U_M, which the author himself later deleted.
The following text is an English translation of the original written in French.
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"August 2000: a first crop circle of fairly classical construction appears at Chilbolton" (quotation of a paragraph from FutEnFol's article)
Have you identified the recurrence formula that determines the geometry and the internal homothety of this "crop circle of fairly classical construction"? "
A small detail that is important when considering the Chilbolton crop circle: the Ummites have always written clearly that silicon cannot be the basic chemistry of life..." If it is only considered in a primitive and isolated way, perhaps?
Carbon-silicon bonds can be produced by living beings:
https://ncbi.nlm.nih.gov/pmc/articles/PMC5243118/
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Below I copy an image of the two Chilbolton crop circles to which U_M refers.

