I should also make sure that the terms are translated appropriately. "Genkai" here might not be debut if they disbanded, so maybe it's a pun or a reference to their comeback. "Niku" meaning muscle could relate to physical performance or training. Alternatively, "niku" can also be slang for something else, but in this context, probably physical aspects. The term "goui sounyuu" might mean combining different elements to enter the market, possibly in a business or media sense.
I need to structure the blog post to explain the origin of the phrase, how it became a meme or a cultural reference, and its significance in 2021. Maybe mention how their energetic style (Bachibachi) became a symbol, and how the term "goui sounyuu" could refer to new projects or combinations in 2021. Also, check if there were specific events in 2021 related to Genki de Kikoeru that revived their old material. Since the group disbanded in 2019, perhaps 2021 saw a revival or tribute projects using their old songs.
Need to ensure that the information is accurate and the connections are logical. Also, maybe include quotes from songs, examples, and cultural context to make it informative. Avoid making things up if unsure. If there's uncertainty, phrase it cautiously.