Do most native speakers understand these Chengyus at all? 霽範永存, 亹亹不卷, 巾袖無光, 鑿枘不入 I am learning some Chengyu but after a google search with inverted commas, only a very small number of usages are found:

266 results for 霽範永存;

720 results for 亹亹不卷;

817 results for 巾袖無光;

886 results for 鑿枘不入.

The small numbers seem to indicate most people do not use these Chengyus, and some people may not even understand them. 

Are these Chengyus considered as outdated? Do most native speakers understand these Chengyus at all?
I would like to say they are uncommon variants of common 成语 or just single case originated from some literature, which I think I am inventing such 成语 everyday. But it requires high level of classical Chinese skills to recognize.

Here I would show what I thought before I search for more info.

霁范永存

身正为范。范乃楷模之意。

又，光风霁月。霁乃晴明之意。

又，正气永存。

So I guess it means:  高节永为世人之楷模。

After searching: Exactly as what I thought.

亹亹不卷

亹亹文王，令闻不已！

勉励的文王啊，他的美名没有止尽。

又，孜孜不倦。

So I guess 卷 is the ancient variant (or origin?) of 倦. So this 成语 means 勤勉而不知疲倦.

After searching: 今作：娓娓不倦，多指谈话娓娓不绝，不知疲倦。

巾袖无光

巾，手帕。袖，衣袖。

又，黯淡无光。

不考虑比喻，似乎就是：衣服不起眼，或陈旧。不能推断意象。

After searching:形容穿戴的服装敝旧不华丽。孤例。

凿枘不入

This is obvious~

方枘圆凿。

They are the same.

After searching: Yes!

P.S.

It is not any four-character, concise word that can be categorized as 成语! A 成语 should be popular enough (at least in its time)!

彼素苑囿籍典，兀兀以穷；今闻鱼跃之喜，定不自胜，故延亲邀友，飨于庭园。倾以仪狄，馔以凤肝，奏以焦尾，焚以龙涎，欢歌笑语，春风踌躇。

See? I use A LOT OF four-character verse, but they are (mostly) not 成语, but my personal invention.