Personally I have not seen this change.
If you can point me anywhere that it states a minimum please do.
If I go to 'deposit funds', then select USD, then select 'bank transfer, US domestic', I see the following text in green font:
NOTE: the minimum amount to transfer is USD$5000.00
If you would like to deposit a smaller amount, please use our Paxum deposit option.
I made a printout last time I deposited funds mostly to keep track of the numbers I needed to use for the wire. There exists similar text there, but it says:
NOTE: the minimum amount to transfer is USD$100.00