It is very ambiguous. "Show up to ....... corrections" means you are asking it to show only some corrections, not all. The language is not correct. Editor using such ambiguous language himself is not to be trusted. The wording should be "show the corrections ( x )". The word "up to" should be removed from it and the number of corrections can be shown within brackets.
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Looks you are very well informed V.M. Thank you for the full explanation. I am glad to hear that the moon-men are supposed to go back to their moonscape - at least, in due course. I am still against tinkering with readers' comments.
It is not really changing comments just correcting typos in grammar. There is nothing for us to do as the errors are fixed. Hopefully, the "bots" will go away after a certain time period.