This may be a dumb question, but does BCP38/RFC2827 interact with or affect VPN usage?

Today, I learned that RFC2827 blocks IP addresses entering the internet that have spoofed/forged source IP addresses. Herein lies the issue - VPNs have become very popular and are more widely used now than in the past 5-10 years, but VPNs “technically” use IP spoofing. If RFC2827 is implemented, will that affect ISP customers who use VPNs? Since RFC2827 was written in 2000 (and is supposedly the best current practice), does this mean that it is still a valid practice?

Context: I’m interning at my local ISP’s office, and this week’s task was researching ISP cybersecurity best practices in depth. Today after reading the article “Cybercrime Prevention: Principles for Internet Service Providers,” it mentioned/recommended implementing BCP38/RFC2827. I’ve fallen into somewhat of a rabbit hole and can’t find any information regarding its affect on VPN usage.