As every datasheet of Single Pair Ethernet component that I have encountered states, 10BASE-T1L is specified by IEEE 802.3CG recommendation.
Unfortunately, according to the IEEE website, last version of that specification, 802.3cg-2019 is marked as superseded.
What makes things worse, there is no clear information by what it is superseded...
This situation is clearly different than for example RFC Internet standard stack, where every obsoleted standard is not only marked as such, but a successor standard is linked (example below)
So - by what is 802.3CG superseded?
IEEE website doesn't mention it neither as "active project" or "active standard", but current version of the main 802.3 specification includes "Historical participants" section with the following description:
The following individuals participated in the IEEE 802.3 working group during various stages of the
standard’s development. Since the initial publication, many IEEE standards have added functionality or
provided updates to material included in this standard. Included is a historical list of participants who have
dedicated their valuable time, energy, and knowledge to the creation of this material:
in which 802.3cg is listed
IEEE Std 802.3cg-2019 Physical Layers Specifications and Management Parameters for 10 Mb/s Operation and Associated Power Delivery over a Single Balanced Pair of Conductors
802.3-2018 doesn't include the above mention, which reinforces the conclusion that 802.3CG was merged into 802.3-2022 after the last version of 802.3CG-2019.
Another clue that 802.3cg is now a part of 802.3 can be found in only one public document in 802.3CG stack, an errata - which consists of one table that can be found in exactly the same form (and the same table identifier) on page 5921 of 802.3-2022
which - in my opinion - proves that Single Pair Ethernet specification is now included in the main 802.3 recommendation and manufacturers could update their datasheets 
