The way the delay announcement was worded says to me that they simply didn't create much of the Themyscira content to begin with. If you have issues with the Themyscira content that needs a few more days than anticipated you could just release the rest (roughly) on time and release a patch/hotfix with the rest of the content a week or so later when it is fixed. But instead they say that if it isn't fixed in a few days it'll simply be cut and put in the next update, presumably with some of that updates content cut short because why put in the extra work if you can get away with minimal effort.
It makes no sense if the content is already fully there to not release it with a small delay/hotfix from the rest of that update's content, unless that content doesn't exist to begin with or you already plan on putting less effort into the next one and wanna pad it with content intended for this release.
My thoughts exactly, it's highly likely the Themyscira content he's promised for this update doesn't really even exist, and the 50/50 focus he talked about in his posts was a lie or at the very least there's incredibly little of it to begin with, but Sunset is using the usual excuse of "we've run into problems" so when the update releases and there's barely any Themyscira content in it, he's gonna say that he planned to have more of it in the update but because of issues he's delaying to the next update, when in reality he just simply made very little content to begin with.
The thing is, lying like this is completely unnecessary. He would lose literally nothing by simply being honest and saying "listen, the the focus for this update was on the MB content that has already been drawn on streams last year, the Themyscira content is highly likely coming in the next update, we'll maybe put a little of it in this update , but no promises."
But nope, instead he said the update's focus would be 50/50 split between the Amazons and the MB, then teased the MB for an entire month while repeatedly saying that the Themyscira content is also coming in every update teaser, then when the time comes to actually release the update, suprise suprise, we ran into problems with the Amazons' content, so we're delaying it to the next update (even though if the content you promised actually existed, you wouldn't delay it to the next update, you would just release a hot fix including said content a few days / weeks later).