China wasn't antagonized enough to take out a dutch garrison that could be overrun by the remnants of a remnant led by the Koxinga with little to no retribution against them from the Dutch after they were taken over by pirates, essentially. The Shimazu and the Kakizaki-Matsumae had little trouble with either Okinawa or Hokkaido, so I don't foresee any significant problems there. There's also little reason to assume that it would take until 1700 for them to reach there, these lands were not unknown. The Philipines engaged in regular trading contact with Chinese merchants and Wakou pirates had attacked there. Its not venturing out into the unknown, but going back to the places Kyushu pirates have already been visiting for a while.
True, but both explorations and eventual conquests take decades, if not centuries, to achieve, along with consolidation afterward. Japan had contacts with Taiwan and the Philippines, mostly through trade, but most of the relations were conducted through the Ryukyus. In addition, expanding significantly further into both mainland and maritime Southeast Asia would be much more difficult due to native resistance and attempting to chart generally unknown territory, not to mention other issues such as climate, topography, disease, remoteness, competition, and the like. I'm not saying that the Japanese can't reach several regions in Southeast Asia by 1650-1700, but that it will take at least a century for them to set up supply routes, establish settlements, and eventually expand them by incorporating and/or conquering the polities in the region. That's all.
I wasn't attempting to reference well reasoned individuals who are misled by modern historical revisionism, rather I was pointing to a handful (about five) people that I had encountered before on the internet that believed many, if not all, of the views that I provided in an attempt to show an example of unreasonable bias. You do not need to defend them, if you had been there you probably wouldn't have even thought to. Everyone starts out ignorant and gradually attains knowledge and understanding, but there are those that believe they start out with all the answers and can only call people misinformed or believing nationalist propaganda while arguing laughable or even genocidal viewpoints.
That's fine, but I was just stating that people often have the potential to change their opinions significantly for the better, although some sadly don't choose to take that path.