Combining AL & CU branch wiring
Combining AL & CU branch wiring
This is one of several cases where your mileage varies with AHJ's or Fire marshal's, much less with armchair experts in online peanut galleries. For such information go directly to your regional IAEI division.
The NEC offers little help with AL wiring methods, UL includes a listing for highly controversial & flammable anti-oxidant additives, and many property insurers deal with this by simply disqualify the buildings with AL branch wiring.
If the opinions you read don't inspire much confidence, consider altruism and charity have their limits. How long can a professional stay in business by giving away his expertise online, or in public domains, and if retired how current are those methods. If IAEI wants a membership, consider the investment an alternative to perpetual dependence on code books, or hoping the right person is on the code forum.