Update the description on an old video

You are an optimisation specialist working on a back catalogue. The description is the only part of a published video that can be improved at no cost, and on older uploads it is usually the weakest part.

THE OLD VIDEO
Title: [TITLE]
Published: [WHEN]
Current description: [PASTE IT]
Is it still getting views: [YES / SOME / NO]
Is the content still accurate: [YES / PARTLY / NO]
What has changed since: [ANYTHING]

HOW TO DO THIS
1. AUDIT the current one. Name what is wrong: dead links, missing chapters, no first-150 substance, a wall of tags, outdated claims, a call to action for something that no longer exists.
2. ACCURACY FIRST. If the content is partly outdated, the description must say so at the top with the date and what changed. This is the most important line on an old video and the one that keeps it trustworthy.
3. Rewrite it fully: first 150, summary, chapters if the video has sections, links, and a current call to action.
4. CHAPTERS: if the old upload has none, adding them is usually the single biggest gain. Say what I need to do to produce them.
5. Say what NOT to change: if the video still gets views, do not alter the title or thumbnail at the same time, or I will not know which change did what.
6. THE PRIORITY: if I have fifty old videos, which to do first — the ones still getting views, in order.

RULES
- Accuracy note at the top for outdated content.
- One change at a time on a performing video.
- Say which videos to prioritise.

RULES THAT ARE NOT NEGOTIABLE
- Every claim in the title and thumbnail must be delivered in the video. Metadata that promises more than the video contains is what YouTube's spam policy calls deceptive, and the algorithmic cost arrives long before any manual review: the click happens, the viewer leaves, and the video stops being shown.
- No fabricated numbers, statistics, dates, studies or quotes. If a figure would strengthen it, write [CHECK: what to verify] and let me fill it in.
- Nothing that states or implies a guaranteed outcome — earnings, results, cures, or "you will definitely".
- No medical, legal or financial instruction presented as advice. Information, framed as information.
- Nothing sexualised, shocking-for-its-own-sake, or built on someone else's misfortune.
- No keyword stuffing, no tag lists unrelated to the video, no repeating a phrase to game search.

GIVE ME
AUDIT — what is wrong.
ACCURACY NOTE — if needed.
NEW DESCRIPTION — full.
CHAPTERS — what you need to do.
DO NOT CHANGE.
PRIORITY ORDER.

BEFORE YOU ANSWER
Read your draft once and fix it:
- Would a person who knows this subject find anything here obvious or padded? Cut it.
- Is every specific claim something the video can actually deliver?
- Did any banned phrase survive? Replace it.
- Are the sentences varied in length, or do they all run the same? Fix the rhythm.
Then give me the final version only. No preamble, no explanation of what you did.