The article states that the "electricity consumed for a single transaction" is equivalent to what 5 households use up in 5 days. Which seems to make you think that one would "use up" less energy by watching TV then by doing a Bitcoin transaction. But that is not true.
Making a Bitcoin transaction uses up hardly any energy.
The miners mine for the block reward. That is completely unrelated to transactions. They even mine if there are no transactions and generate empty blocks.
If nobody made a Bitcoin transaction for a month, the energy consumption of that month would stay pretty much the same.