Do you have a source to support this? Nothing I have seen from HSLDA or CHN would confirm it. Indeed, quite the contrary; they have opposed various pre-school scams, but I have not seen one that they considered a direct threat to independent home education.
The Dems called it "lowering the age" of schooling for children. Catch 5 extra minutes, I'll dig it up.
SB 550 Legislative Alert. SB5505 Year-Old Compulsory Education>--snip:
CHN very much appreciates the continued efforts of Family Protection Ministries regarding legislative matters in California, and we are sharing information that they sent to us earlier today, Monday, August 9th. This FPM alert has gone out to their members, and CHN believes that it contains information that many of our members will want to know as well so that they may respond accordingly. The alert regards Bill: SB 550 and concerns dropping compulsory education from age 6 to age 5, and this is something that CHN and others have successfully fought for many years.
--end snip.
There have been other rumblings, non-ending, to lower the age of compulsory ed.
Lowering the "compulsory" age to 5 is considered "PRESCHOOL".