That may not only look complex at the beginning,el shaddy, it most likely also just is. It can be rather complex and confusing to explain as I wrote in the article. It was also for me at the start trying to calculate the correct pulse times and pulse shapes. And Reverse engineering an unknown circuit almost always is a bit more complicated. But in the end when you finally grasp the details of using these counter/divider chips, it probably will be very clear to you next time.
I also added more about the circuit in the comments after the article which may be of additional help. Thanks for your appreciated comment

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Or this one Arduino based complete with PDF instructions and software:

https://www.electronicsforu.com/electronics-projects/hardware-diy/arduino-based-digital-ic-tester-truth-table/3

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http://oldcomputer.info/software/ictester/index.html

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About the 4060, it sadly is only a 14 bit counter/divider as you know.
[http://electro87expert.blogspot.com/2007/05/24-hour-timer-by-ic-4060.html]
And the clocks that run on this pulse giver apparently need the exact 30 sec positive and the 30 seconds negative block pulse in every minute. The designer was a real genius in the way how he made this 15 bit divider/counter followed by a 8 bit divider/counter. Making the exact timed block output pulse every 60 seconds.
If it had been a 74(LS)92 12 bit counter/divider as is used in the Exachron DCF receiver repair, that chip contains a 2 bit counter/divider followed by a 6 bit counter/divider when they are placed after each other.

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Here another link to software of the ELV-IC tester with PC ISA slot card:

http://www.sax.de/~zander/zubehoer/k1520/ELV-IC-Tester/

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https://de.elv.com/elv-ic-tester-204452
(software for PC used was IC-Pascal for IC's upto 20 pins including counter IC's 74163, 7490,7492,4024, RAM2114, PCF8574/A etc.etc., and works perfectly starting with Windows 95/98. And with the integrated editor new tests can be added easily. The program also contains an IC Info database in German, and a IC function simulator).
About the perfect working stand-alone Elektuur cmos/ttl IC-tester from March and April 1998 Elektuur magazine, I will upload the info files to Jestine. I made this great working IC-tester somewhere in 1998 that outruns the Genius and the TL866 testers on most if not all special IC's like the mentioned counter IC's. And you can also add new testvectors to add new tests to the existing already great working hardware.

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