First off, thank you so much for checking into that and getting a response! I didn't expect you to get an answer. It still doesn't add up though, mathematically. If it kept the 1C rate from 0-80 that would be 40 minutes anyway so I'm not sure where the 1.5C factors in. Second, and more interestingly, it looks like H-D is saying it's a 60Ah battery pack and it's 13.7kWh nominal. So, 13700 / 60 = 228.3 Volts is in the operating range. The minimum for CCS charging is 200V, and the charge rates get weaker the lower the voltage.Here's the answer I got, directly from Harley-Davidson:
"At low battery SOC, the LiveWire will charge at 90A (1.5C) and step down to 60A (1C). This profile was developed to optimize performance over the life of the product. Charge rates are based on a combination of cell chemistry, targeted battery design life, and warranty duration."