Yes but ..,
You sold 4 items in June, about 10 in May (the whole month), and currently have 2 items listed.
So, If you sold 50 items within the space of a few days and had to use SD to send them, you would have to queue up in the Post Office.
However, items sold for under £10, which are 100g or less and letter size are exempt from SD.
(Although sellers have said they haven't been able to list small items without SD recently - it may be working now.)
To be honest, I would assume most private sellers simply don't have 50 items to send at once. For me, with 1-3 sales a week currently, that would be so amazing I wouldn't mind spending an hour in the Post Office.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)