PA vote objections

To anyone like me who didn't know what prompted the objection to the Pennsylvania vote last night, here's what it seemed to be about. In 2019, PA updated their election code, in part to expand mail-in-voting rights.
 
This is only the second time the new laws have been in use, and some of the rough edges haven't been smoothed over. Two dates in the law came into conflict this time around. First, requests for mail-in ballots have to be in the county's hands a week before the election. Second, they're not allowed to be submitted after election day.
With massive disruptions to the post office's operations this year, that 1-week window between the ballot request and submission was far too small. It seemed likely that late but legal submissions would arrive after election day and wouldn't be counted. The problem was presented to the state supreme court, who extended the valid deadline of votes by 3 days.
 
Last night, objectors claimed that the court's ruling changed the law (a power of the legislature) instead of simply interpreting it (a power of the judiciary). It's not an unreasonable concern in theory, but it's not clear if it actually applies here. Its survival of multiple challenges strongly suggests it doesn't. I didn't see any references to how many votes were actually impacted by the ruling.