Risky. If I interview somebody and their resume is inflated or wrong, at best as a candidate you wasted my time reviewing your resume and scheduling interviews and what not, and now you're starting from a disadvantage because my first impression of you is one of being misled. We're a high-trust organization and anything that causes doubt on your integrity puts you at a disadvantage. If I'm interviewing you, it's because I considered you against the torrent of other applicants, and I likely excluded one that is more qualified than you based on your misrepresentation. That also doesn't work in your favor.
If you are a truly exceptional dev in your previous field and can convince me of that, along with an up-front and transparent explanation of why you lied to me as our first interaction, it is possible to overcome this. However, that is a pretty small pool of people.
Definitely fair but for the candidate considering this, it's a numbers game. They're just looking to get their foot in the door for a new career path. You care, and you're right to care, but there will be others who don't.
Then next time, it's no longer a lie and they can (in theory) get by on merit
