I don't understand why you would need to PPP an immigrant ancestor who arrived in 1929. Is there a great possibility that the person(s) will be duplicated, have parents removed/changed, etc. just because they were the first generation in your line to live in the US? From what I can see, the further back you go, the more likely you are to need PPP, since there are increasingly large numbers of descendants. I don't know how large your family is, but if there isn't a lot of danger of duplication, etc, it's not really necessary. FOREX: my 4th great grandfather came to the US from Germany in 1843. He has no PPP and his profile has been up since 2016. No duplication, nobody has been changing his parents, asking for merges, etc. There is no reason for a PPP. He has a sticker for "German immigrant to Ohio" but that's it.
If your ancestor came to the US in 1929 and was born after 1868, you can use privacy to "protect" him/her anyway.