See the IRS rules for withdrawal of excess contributions in the section of IRS Publication 590A at this link. The language in 590A is a generic "on or before the due date", so yes, because the due date has been extended to July 15th, that is the date for you to remove the excess contribution:
"Withdrawal of excess contributions.
For purposes of determining excess contributions, any contribution that is withdrawn on or before the due date (including extensions) for filing your tax return for the year is treated as an amount not contributed."
@alexluc88
[Edited 04/03/2020|2:08pm PST]
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