https://www.airbus.com/en/careers/students-and-graduates/graduates
The opportunity is aimed at Master's students who expect to graduate by September 2027.
Applications are now open for candidates who would start working in September of next year (of course, you must have obtained your degree by the time the program begins).
Therefore, there is no need to wait until after graduation to apply. Instead, candidates should expect to graduate within the following year; otherwise, they risk missing the opportunity and effectively losing a year.