As far as I know, this is still a viable tax strategy, but most people will have extreme difficulty finding opportunities to invest in extremely early stage companies and must be accredited investors.
The legislation would also disallow IRA investments that require owners to be accredited investors.[1]
[1] https://www.cnbc.com/2021/09/13/house-democrats-propose-new-...
$2000 of pre-IPO shares costing less than a penny each into $5 billion