They are absolutely not, and at this point anyone claiming as much is being malicious.
Yes, Biden could have done better on railroads, but his administration:
* Made millions more workers eligible for overtime pay
* Installed union leaders on the NLRB (contrast to Republicans who fired members, defunded efforts, and gave access to NRLB data to Musk/Palantir/etc.)
* Those new NLRB members issued the Cemex decision making it harder for companies to suppress union voting
* Issued any number of rules in favor of workers i.e. https://www.dol.gov/newsroom/releases/olms/olms20230727
* Raised the contractor minimum wage
* Increased funding for the NLRB
* Ensured that companies couldn't avoid penalties by forming smaller companies - a process the Trump NLRB created to make it harder to penalize companies unionbusting
This is only a few things. There is a world of difference.