The delay notice announces that the fifth episode of the series and the following ones have been postponed due to an increase in COVID-19 infections in anime studios. So, with the fifth episode only coming out in mid-August, the show will re-release parts every week as scheduled.
If you are unfamiliar with the Isekai Ojisan series , you can read the description here :
Takafumi’s uncle, who has been in a coma for 17 years, suddenly wakes up, starts speaking in a strange language and seems to be in possession of magical powers.