well i'm sure i one-up myself sooner or later. perhaps now.
ok well here are a selections of sources for those numbers, 1985 specifically in the FBI docs. i don't see where encryption or lack thereof has had any effect. i don't see much likelihood it can have any effect on them. the felonious deaths appear to be caused mainly by bad actors with firearms. there's not much you can do to have an effect on that either, aside from mandatory wearing of vests. Encryption is unlikely to have a prophylactic effect on COVID-19, which i suppose the "more than in over 40 years" bit was referring to.
2020 Gunfire: 25 in first half
2020
2019 Gunfire: 48
The Officer Down Memorial Page (ODMP)
1985 Gunfire: 70
https://www.ncjrs.gov/pdffiles1/Digitization/126498NCJRS.pdf
Just look.
https://nleomf.org/wp-content/uploads/2019/05/Causes-Law-Enforcement-Deaths-2009-2018.pdf
Notice the variability
https://nleomf.org/wp-content/uploads/2019/05/Officer-Deaths-by-Year-updated-4-10-2019.pdf
And the decade by decade trends up thru about 5 years ago.
Data on police officers killed since 1961 | Dan Wang
its all about Risk-Management and trying to change the things you actually have the power to change. If you want to lower LEO fatalities, your more likely to get results pursuing a reduction from accident/health causes (that are being ignored and of which one can act preventatively) than felonious acts of murder (which no one is ignoring, but are out of ones control except in the reactive). I don't see where encryption plays a role.