All indications seem to say yes. I know Chapek appeared on CNBC the morning of May 11 and discussed the encouraging reopening day (because of the time difference, SDL really opened the evening of May 10th here). From a health and safety perspective (which I think, at the moment, is what matters most to Disney), we've heard reports that mask compliance has been strong but enforcing/promoting social distancing has been a bit more of a challenge, but as far as I can tell, there haven't been any reports of new outbreaks tied to the park or even the Shanghai area. Overall, SDL's reopening seems to have received fairly good press.
Economically, which as you said is also very important, SDL's reopening has also seemed to be successful. Opening day tickets sold out relatively quickly, and at the moment, the next day you can buy a park ticket for is June 1, so that's a very encouraging sign. As Chapek said earlier this month, the government is capping attendance at 30% and they're starting off well below that and working they're way up to that threshold in increments. It also appears that they may have quietly stopped selling half-day tickets (something that SDL, much like WDW, had not offered to the general public before their closure), which to me indicates that there is substantial interest for the full-day tickets. Additionally, last week, we saw SDL begin presenting indoor shows like the Frozen Sing-Along Celebration and their PotC stunt show. Of course, they're seating every other row and leaving ample space between parties, but to me, this seems like not only an indicator of health/safety success but also economic success for the park's reopening. Even if park officials felt it would be possible to hold these shows while maintaining social distancing, they wouldn't reopen them unless they felt they could "afford" to (sort of the reverse of when WDW cuts entertainment to save money).
Obviously, I'm not sure how much money you can make operating a park at no more than a third of its maximum capacity. I don't think we'll know the answer to that until at least the next earnings call (if ever), but it is my opinion (so take it FWIW) that SDL's reopening is not really affecting the U.S. parks' reopening plans. Remember that SDL was closed from late January (1/25) through mid-May (5/10); that's 3.5/almost 4 month closure. Our parks have been closed just over two months. With the Shanghai timeline, WDW would theoretically open in early July, but as I've said for a while now, you can't necessarily draw a direct comparison between the two, given that they are different outbreaks, different cultures, and different responses. For example, SDL's Disneytown (their DS equivalent) reopened 6 or so weeks after SDL closed. DS reopened more than 8 weeks after WDW's parks closed. So in short, I don't think SDL "delayed" a WDW reopening. I think it's very likely many of the same procedures and protocols there will be applied here upon WDW's reopening, but there are many other factors affecting WDW's reopening like the different situation here in the U.S.
