I expect that no figure ever tended to the courts this way is actually correct literally to the date of filing. It's whatever numbers were in the most recent accounts when it was signed off.
If the last number you saw was ~$5b as of last month, claiming revenue "exceeding $5 billion to date" doesn't seem unreasonable - it's still true.
Could've possibly made a stronger claim, but the affidavit may have been drafted/written before February's numbers were determined, even if those numbers were in by the time it'd been reviewed by their legal team and submitted.
[0] https://storage.courtlistener.com/recap/gov.uscourts.cand.46...