This sort of aged itself out...
The DP so far hasn't doled out the same punishment as the PGATour, but they are no doubt on a similar track...
Ehh, not really. The 3 events the players are suspended from the Scottish Open, Barbasol, and Barracuda. All are co-sanctioned PGA Tour events, so by way of the PGA tour suspension they would have already been suspended from those events anyway.
They also made this announcement the week of the BMW International, in which LIV players participate, and the have made no comment on the JP McManus which takes place prior to the Scottish Open.
So other than the fine, no other punishment has been applied by the DP World Tour. DP could actually have a lot of power here if they want it, since they already do business with the Saudis and the rest of the middle east it may be more out of line for them to shun LIV entirely. But new talks of strengthening the strategic alliance with the PGA Tour would suggest they are more concerned than they should be, or are utilizing their position to extract more from a concerned PGA Tour.