I've read nothing to indicate this. It's not just the alternator but the "vehicle charging system" of which the alternator is part of. From my understanding this smartness is about voltage (pressure). The idea is that the voltage is lowered when the battery SOC is determined to be "high" via the BMS/shunt measuring amps in and out. When the BMS thinks the battery is replenished it lowers the voltage. Voltage times amps is work (watts). Lowering the work on the alternator lowers the resistance at the belt. So the BMS is a key player in all of this which is why it can compromise things to connect directly to the battery negative terminal as that is where amps in and out are being measured. That BMS is looking at amps going out and amps going in as well as resting battery voltage to determine SOC. If you directly connect to the negative side you are going to see current from not just the cranking battery but also from the house bank. If the BMS is programed to a certain number of AH for the cranking battery then it is not going to be able to determine an accurate SOC and potentially corrupt the commands to the rest of the system.Is this ability to respond to the battery because the alternator in the 2020s is "smarter" than previous Transit alternators?
All that being said, if you have a house bank that is depleted it will try to draw a lot of current and that will lower the voltage in the charging system regardless of a CCP connection or direct to battery positive. That voltage drop will signal the charging system to kick into gear and bring the voltage to where it thinks the battery needs it according to the BMS. That voltage level is for AGM batteries and may not be sufficient to get Li batteries above 80%. I guess if you are willing to oversize your Li house bank by 20% you are golden as long as you don't over draw whatever connection you have to the vehicle charging system.
All of this is what has me considering charging Li house batteries directly with a connection that can handle the 1C amps of the bank and then letting solar top off the last 20% when it can. Just an interesting theory at this point. With an AGM battery bank you have both a lower 1C (max charge rate) and lower voltage required to fully charge. So maybe with Li you over size by 20%. But, you still have to make sure your charge rate does not overrun your positive connection to the vehicle charging system.
Again, I am more than happy to have a real engineer blow all this up.