sure they are, but as you can see from the chart, there is hardly any significant flow from retail (I assume they are lumped together as "Others" if even counted), and secondly, the transaction amounts are a drop on a hot stone relative to the total savings in Japan. Also consider the flows of foreigners in and out of Japan. Admittedly this year has seen a lot of outflow from Japan into Int'l markets or a repatriation of foreign investments in Japan back to Europe/US. I hear that most international fund managers have given up on Abenomics.
This is one of the reasons (I think I have posted a link to this chart before):
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Obviously, much depends on whether these purchases/sales are hedged, but I would argue that these flows are very meaningful for the ccy either way.