There's a lot of "if" in that article when real data is easily available. I downloaded CDC data
here and compared deaths in people under 65 in Q3 of 2020 to Q3 of 2021. This is by week, not month, so I included every week
ending during Q3. This means there could be a slight error in the data if one year has 1 or 2 more days included than the other (1 additional day would be about 1% error).
There was a 14.2% increase in total deaths in people under age 65 in 2021. 91.3% of that is accounted for by the increase in covid deaths (154% increase from 2020 to 2021 - Q3 of 2020 was a very low covid period). Non-covid-coded deaths increased by 1.3% in 2021 over 2020.
You can browse through data for all states and all ages in that link. I don't see anything (including looking specifically at Indiana) that shows some unusual spike in deaths.