'On Schedule' = routinely at 10k miles or less.
Also, from shop owner:
"After performing the timing chain repair, water pump and supercharger isolator as outlined the rattling noise you are hearing in the videos will be resolved. The VVT’s are being replaced along with the timing chain repair, they’ve been included in the quote. If there was a stuck valve, we should experience engine performance issue and a check engine light. Anything is possible, overdue oil changes or incorrect oil type may cause undesirable engine noises. There is no indication for me to comment on the likelihood of premature wear in the piston rings or rod bearings as they are not accessible and would require stripping down to engine to gain a visual (not a practical approach). However, if there was premature wear on the piston rings there should be many other indictors of that of which none are present. If a rod bearing is worn there would be a clunking noise at the bottom of the engine and a low oil pressure condition, there is not.
If either the rod bearings or piston rings are compromised, I guess they can be temporarily disguised with the use of much thicker viscosity engine oil or some sort of additive. But there is no way for us to determine that, only after we replace the engine oil knowing we used the correct oil can we determine that. This is not to suggest that [current owner] has been using incorrect oils or not performing services as required, that you should discuss with him. Just want to offer you all the hypotheticals."