Prime factorisation is indeed nobody's primary idea of what a quantum computer will be useful for in practice any time soon, but it cannot be denied that Shor's algorithm is the first and only method of prime factorisation we have discovered which can finish in realistic time with realistic resources.
And that means that RSA is no longer as safe as it once was, justifying the process of finding alternatives.
We should find out next week at APS Global if it's really a problem or a case of Physicist Sergey Frolov, the author of that quote, failing to understand what's been done.
Microsoft could be full of shit about Majorana 1 of course but it would be damned odd for them to make a claim like this without being able to back it up; the fallout would be horrendous.