(Because major sources of the poem are "Buko Nenpyo," or "Chronology of the Edo Period," published in 1878, as well as "Edo Jidai Rakusho Ruiju," or "Anonymous Documents of Social and Political Satire of the Edo Period," published in 1914.) and this satirical poem is not found in contemporary publications, while similar poems do appear, one explanation for this is that the poem was both written and circulated after the fact, as is suggested by its major historical sources being published after the Meiji era.
（ただし、同時代史料においては類似した句が見られるのみで、主に明治11年（1878年）の『武江年表』や大正3年（1914年）『江戸時代落書類聚』など、明治以降に出典が見られることから、後世に喧伝された歌である可能性も指摘されている。