I did the tests. The installation only works if done with DBI and doing a forced downgrade in encryption. Conclusion: It works by doing workarounds, but the existence and possible need for 17.0.1 sigpatches is real.
Splatoon 3 latest update not installing because sigpaptches. Rocket League latest update not installing because sigpaptches. Trying install on latest Tinfoil. "Convert to standard cripto" not working.