I'm going to (politely) call you on that one. I have the Anker 45W Nano II which I use when away from home, and the Apple 30W at home. I've been of the opinion that my M1 MBA charged faster with the Anker. Tonight I used my "KILL A WATT" on my mostly discharged MBA. No USB-C connected, each read 0W. With the Apple, load from 118VAC line ramped up over perhaps 7 or 8 seconds to 30W. With the Anker, similar ramp, but to 46W.
I monitored VA as well, and it was in similar proportions.
I don't have a higher power charger to try, but am confident the MBA doesn't limit charge to 30W and will accept near 45W. Conversion efficiency is not, of course, 100%, so I'd estimate charge rate based on these numbers being accurate at probably 28 and 42 Watts. The meter is at the bottom of its range, so I won't guarantee my data.