Assuming this is in the US, federal law prohibits companies from putting these types of conditions on warranties. Nissan can
say that the warranty is void if you don't come in for the battery inspection, but that doesn't mean that it's true. The law would only allow a company to void a warranty claim in that situation if the company can show that the owner's failure to keep that condition is what led to the failure.
In fact, if you read the warranty wording, that's really what Nissan is saying:
You are required to perform annual EV Battery Usage Reports...
Any damage or failure resulting from a failure to have these required services performed, or
that could have been avoided had these services been performed, is not covered under warranty.
Since it's just a report, Nissan would never be able to show that failing to run a report
caused a failure, and they'd be almost equally hard pressed to prove that some battery repair you're claiming later could have been avoided if you
had run the report.
The fact is that Nissan has never denied a battery claim because this Usage Report was not done. Additionally, as of the 2023 LEAF, that wording is not even in the warranty booklet.
So, don't worry about it.