parseISO v2 documentation currently states

The previous parse implementation was renamed to parseISO.

parse v2 documentation currently states

Old parse was renamed to toDate. Now parse is a new function which parses a string using a provided format.

I think considering the sentence is to divert people who have previously been using v1 parse to the correct v2 equivalent, it only needs to exist in docs for parse. If the sentence exists on parseISO, it should appear on toDate also.

Additionally I think the sentence would benefit from a more detailed explanation of what happened to the old parse method. Would this suffice

The v1 parse implementation was split into two functions. If you have a date|timestamp you should use toDate. If you have a string in ISO 8601 format then you should use parseISO. For strings in other formats you should use the new parse implementation which will parse the string using a provided format.